locale.c: Use proper #ifdef to enable behavior

This changes to use USE_POSIX_2008_LOCALE instead of
HAS_POSIX_2008_LOCALE.  Rarely do they differ, but someone may choose to
configure their installation to not use these more modern functions,
even if available, perhaps because they're buggy on that system.

diff --git a/locale.c b/locale.c
index 54b51ff..482a533 100644 (file)
--- a/locale.c
+++ b/locale.c
@@ -5274,9 +5274,9 @@ Perl_my_strerror(pTHX_ const int errnum)
         Safefree(save_locale);
     }
 
-#  elif defined(HAS_POSIX_2008_LOCALE)                      \
-     && defined(HAS_STRERROR_L)                             \
-     && defined(HAS_DUPLOCALE)
+#  elif   defined(USE_POSIX_2008_LOCALE)                      \
+     &&   defined(HAS_STRERROR_L)                             \
+     &&   defined(HAS_DUPLOCALE)
 
     /* This function is also trivial if we don't have to worry about thread
      * safety and have strerror_l(), as it handles the switch of locales so we