perl.h: Expand scope of cpp conditional

This just doesn't bother with checking some locale-related stuff if not
paying attention to locales.

perl.h

@@ -1098,16 +1098,16 @@ Example usage:
 #      define USE_POSIX_2008_LOCALE
 #    endif
 #  endif
-#endif
 
 /*  Microsoft documentation reads in the change log for VS 2015:
  *     "The localeconv function declared in locale.h now works correctly when
  *     per-thread locale is enabled. In previous versions of the library, this
  *     function would return the lconv data for the global locale, not the
  *     thread's locale."
  */
-#if defined(WIN32) && defined(USE_THREAD_SAFE_LOCALE) && _MSC_VER < 1900
-#  define TS_W32_BROKEN_LOCALECONV
+#  if defined(WIN32) && defined(USE_THREAD_SAFE_LOCALE) && _MSC_VER < 1900
+#    define TS_W32_BROKEN_LOCALECONV
+#  endif
 #endif
 
 #include <setjmp.h>