Only install .pc files for which we build a .so.

Many .so files are not built on arm64, but currently we install
the .pc files anyway. Fix by including the .pc files in the ARM64
conditional.

CMakeLists.txt

@@ -11,9 +11,11 @@ SET(PROJECT_APIVER "${PROJECT_VER}")
 if(ARM64)
    set(BUILD_MMAL FALSE)
    set(BUILD_MMAL_APPS FALSE)
+   set(PKGCONFFILES bcm_host.pc)
 else()
    set(BUILD_MMAL TRUE)
    set(BUILD_MMAL_APPS TRUE)
+   set(PKGCONFFILES bcm_host.pc brcmegl.pc brcmglesv2.pc brcmvg.pc vcsm.pc mmal.pc)
 endif()
 set(vmcs_root ${PROJECT_SOURCE_DIR})
 get_filename_component(VIDEOCORE_ROOT . ABSOLUTE)
@@ -122,7 +124,7 @@ include_directories("${PROJECT_BINARY_DIR}")
 include(FindPkgConfig QUIET)
 if(PKG_CONFIG_FOUND)
 	# Produce a pkg-config file
-	foreach(PCFILE bcm_host.pc brcmegl.pc brcmglesv2.pc brcmvg.pc vcsm.pc mmal.pc)
+	foreach(PCFILE IN LISTS PKGCONFFILES)
 		configure_file("pkgconfig/${PCFILE}.in" "${PCFILE}" @ONLY)
 		install(FILES       "${CMAKE_CURRENT_BINARY_DIR}/${PCFILE}"
 			DESTINATION "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig")