perl_langinfo.h: Resume some assumptions

To save some typing, I assumed that if a system had these glibc-only
locale categories, that it would have all elements that comprise them.
For example with LC_PAPER, the elements are the height and width of a
piece of paper.  It doesn't make any sense to have LC_PAPER without any
dimensions available.

But Android has LC_PAPER without paper dimensions; the same with all the
other elements in the glibc category extensions.  See GH #22627.

I believe that means that these categories are useless on this platform.

But this commit now checks each element for existence individually;
removing the assumption that if the category exists, the element must
too.

perl_langinfo.h

@@ -253,70 +253,170 @@ typedef int nl_item;    /* Substitute 'int' for emulated nl_langinfo() */
  * conflict with some other value, in which case after much gnashing of teeth
  * you will find this comment, and end up having to adjust the numbers.   But
  * glibc values are not (so far) negative */
-#if ! defined(HAS_NL_LANGINFO) || ! defined(LC_ADDRESS)
-#  define _NL_ADDRESS_POSTAL_FMT -58
-#  define _NL_ADDRESS_COUNTRY_NAME -59
-#  define _NL_ADDRESS_COUNTRY_POST -60
-#  define _NL_ADDRESS_COUNTRY_AB2 -61
-#  define _NL_ADDRESS_COUNTRY_AB3 -62
-#  define _NL_ADDRESS_COUNTRY_CAR -63
-#  define _NL_ADDRESS_COUNTRY_NUM -64
-#  define _NL_ADDRESS_COUNTRY_ISBN -65
-#  define _NL_ADDRESS_LANG_NAME -66
-#  define _NL_ADDRESS_LANG_AB -67
-#  define _NL_ADDRESS_LANG_TERM -68
-#  define _NL_ADDRESS_LANG_LIB -69
-
+#ifndef  _NL_ADDRESS_POSTAL_FMT
+#  define  _NL_ADDRESS_POSTAL_FMT -58
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_COUNTRY_NAME
+#  define  _NL_ADDRESS_COUNTRY_NAME -59
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_COUNTRY_POST
+#  define  _NL_ADDRESS_COUNTRY_POST -60
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_COUNTRY_AB2
+#  define  _NL_ADDRESS_COUNTRY_AB2 -61
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_COUNTRY_AB3
+#  define  _NL_ADDRESS_COUNTRY_AB3 -62
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_COUNTRY_CAR
+#  define  _NL_ADDRESS_COUNTRY_CAR -63
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_COUNTRY_NUM
+#  define  _NL_ADDRESS_COUNTRY_NUM -64
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_COUNTRY_ISBN
+#  define  _NL_ADDRESS_COUNTRY_ISBN -65
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_LANG_NAME
+#  define  _NL_ADDRESS_LANG_NAME -66
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_LANG_AB
+#  define  _NL_ADDRESS_LANG_AB -67
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_LANG_TERM
+#  define  _NL_ADDRESS_LANG_TERM -68
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_ADDRESS_LANG_LIB
+#  define  _NL_ADDRESS_LANG_LIB -69
 #  define HAS_MISSING_LANGINFO_ITEM_
 #endif
-#if ! defined(HAS_NL_LANGINFO) || ! defined(LC_IDENTIFICATION)
-#  define _NL_IDENTIFICATION_TITLE -70
-#  define _NL_IDENTIFICATION_SOURCE -71
-#  define _NL_IDENTIFICATION_ADDRESS -72
-#  define _NL_IDENTIFICATION_CONTACT -73
-#  define _NL_IDENTIFICATION_EMAIL -74
-#  define _NL_IDENTIFICATION_TEL -75
-#  define _NL_IDENTIFICATION_FAX -76
-#  define _NL_IDENTIFICATION_LANGUAGE -77
-#  define _NL_IDENTIFICATION_TERRITORY -78
-#  define _NL_IDENTIFICATION_AUDIENCE -79
-#  define _NL_IDENTIFICATION_APPLICATION -80
-#  define _NL_IDENTIFICATION_ABBREVIATION -81
-#  define _NL_IDENTIFICATION_REVISION -82
-#  define _NL_IDENTIFICATION_DATE -83
-#  define _NL_IDENTIFICATION_CATEGORY -84
 
+#ifndef  _NL_IDENTIFICATION_TITLE
+#  define  _NL_IDENTIFICATION_TITLE -70
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_SOURCE
+#  define  _NL_IDENTIFICATION_SOURCE -71
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_ADDRESS
+#  define  _NL_IDENTIFICATION_ADDRESS -72
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_CONTACT
+#  define  _NL_IDENTIFICATION_CONTACT -73
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_EMAIL
+#  define  _NL_IDENTIFICATION_EMAIL -74
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_TEL
+#  define  _NL_IDENTIFICATION_TEL -75
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_FAX
+#  define  _NL_IDENTIFICATION_FAX -76
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_LANGUAGE
+#  define  _NL_IDENTIFICATION_LANGUAGE -77
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_TERRITORY
+#  define  _NL_IDENTIFICATION_TERRITORY -78
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_AUDIENCE
+#  define  _NL_IDENTIFICATION_AUDIENCE -79
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_APPLICATION
+#  define  _NL_IDENTIFICATION_APPLICATION -80
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_ABBREVIATION
+#  define  _NL_IDENTIFICATION_ABBREVIATION -81
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_REVISION
+#  define  _NL_IDENTIFICATION_REVISION -82
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_DATE
+#  define  _NL_IDENTIFICATION_DATE -83
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_IDENTIFICATION_CATEGORY
+#  define  _NL_IDENTIFICATION_CATEGORY -84
 #  define HAS_MISSING_LANGINFO_ITEM_
 #endif
-#if ! defined(HAS_NL_LANGINFO) || ! defined(LC_MEASUREMENT)
-#  define _NL_MEASUREMENT_MEASUREMENT -85
 
+#ifndef  _NL_MEASUREMENT_MEASUREMENT
+#  define  _NL_MEASUREMENT_MEASUREMENT -85
 #  define HAS_MISSING_LANGINFO_ITEM_
 #endif
-#if ! defined(HAS_NL_LANGINFO) || ! defined(LC_NAME)
-#  define _NL_NAME_NAME_FMT -86
-#  define _NL_NAME_NAME_GEN -87
-#  define _NL_NAME_NAME_MR -88
-#  define _NL_NAME_NAME_MRS -89
-#  define _NL_NAME_NAME_MISS -90
-#  define _NL_NAME_NAME_MS -91
 
+#ifndef  _NL_NAME_NAME_FMT
+#  define  _NL_NAME_NAME_FMT -86
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_NAME_NAME_GEN
+#  define  _NL_NAME_NAME_GEN -87
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_NAME_NAME_MR
+#  define  _NL_NAME_NAME_MR -88
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_NAME_NAME_MRS
+#  define  _NL_NAME_NAME_MRS -89
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_NAME_NAME_MISS
+#  define  _NL_NAME_NAME_MISS -90
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_NAME_NAME_MS
+#  define  _NL_NAME_NAME_MS -91
 #  define HAS_MISSING_LANGINFO_ITEM_
 #endif
-#if ! defined(HAS_NL_LANGINFO) || ! defined(LC_PAPER)
-#  define _NL_PAPER_HEIGHT -92
-#  define _NL_PAPER_WIDTH -93
 
+#ifndef  _NL_PAPER_HEIGHT
+#  define  _NL_PAPER_HEIGHT -92
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_PAPER_WIDTH
+#  define  _NL_PAPER_WIDTH -93
 #  define HAS_MISSING_LANGINFO_ITEM_
 #endif
-#if ! defined(HAS_NL_LANGINFO) || ! defined(LC_TELEPHONE)
-#  define _NL_TELEPHONE_TEL_INT_FMT -94
-#  define _NL_TELEPHONE_TEL_DOM_FMT -95
-#  define _NL_TELEPHONE_INT_SELECT -96
-#  define _NL_TELEPHONE_INT_PREFIX -97
 
+#ifndef  _NL_TELEPHONE_TEL_INT_FMT
+#  define  _NL_TELEPHONE_TEL_INT_FMT -94
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_TELEPHONE_TEL_DOM_FMT
+#  define  _NL_TELEPHONE_TEL_DOM_FMT -95
+#  define HAS_MISSING_LANGINFO_ITEM_
+#endif
+#ifndef  _NL_TELEPHONE_INT_SELECT
+#  define  _NL_TELEPHONE_INT_SELECT -96
 #  define HAS_MISSING_LANGINFO_ITEM_
 #endif
+#ifndef  _NL_TELEPHONE_INT_PREFIX
+#  define  _NL_TELEPHONE_INT_PREFIX -97
+#endif
 
 /* All these categories have to be emulated if not available on the platform */
 #if ! LC_CTYPE_AVAIL_           \