[libc++] Guard transitive include of <locale> with availability macro (llvm#97869)

This is a follow-up to llvm#85521,
similar to llvm#95686.

Author: var-const

libcxx/include/chrono

@@ -996,7 +996,9 @@ constexpr chrono::year                                  operator ""y(unsigned lo
 
 #if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER == 20
 #  include <charconv>
-#  include <locale>
+#  if !defined(_LIBCPP_HAS_NO_LOCALIZATION)
+#    include <locale>
+#  endif
 #  include <ostream>
 #endif