CMakeList: add option to not install NuGet packaging

The NuGet hiredis.target packaging description file is of no use on
systems that are not using NuGet, like Linux systems, and the spurious
presence of that file is not "clean".

Add a cmake option to allow users to disable installation of that file.
As some people may have relied on that file to be installed, continue to
install it by default.

Signed-off-by: Yann E. MORIN <[email protected]>

CMakeLists.txt

@@ -6,6 +6,9 @@ OPTION(DISABLE_TESTS "If tests should be compiled or not" OFF)
 OPTION(ENABLE_SSL_TESTS "Should we test SSL connections" OFF)
 OPTION(ENABLE_EXAMPLES "Enable building hiredis examples" OFF)
 OPTION(ENABLE_ASYNC_TESTS "Should we run all asynchronous API tests" OFF)
+# Historically, the NuGet file was always install; default
+# to ON for those who rely on that historical behaviour.
+OPTION(ENABLE_NUGET "Install NuGET packaging details" ON)
 
 MACRO(getVersionBit name)
   SET(VERSION_REGEX "^#define ${name} (.+)$")
@@ -105,9 +108,11 @@ if (MSVC AND BUILD_SHARED_LIBS)
         CONFIGURATIONS Debug RelWithDebInfo)
 endif()
 
-# For NuGet packages
-INSTALL(FILES hiredis.targets
-    DESTINATION build/native)
+if (ENABLE_NUGET)
+    # For NuGet packages
+    INSTALL(FILES hiredis.targets
+        DESTINATION build/native)
+endif()
 
 INSTALL(FILES hiredis.h read.h sds.h async.h alloc.h sockcompat.h
     DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/hiredis)