w32: Use UTF-8 for localized error descriptions for all threads

* src/version.c (do_subsystem_inits) [W32]: Switch gettext to UTF-8
for current thread and all new threads.
--

We did already enable UTF-8, but it was only effective for the main
thread. Now we enable it also for all new threads (if supported by
libgpg-error). This way debug output in background threads now also
uses UTF-8.

GnuPG-bug-id: 7188

src/version.c

@@ -74,7 +74,11 @@ do_subsystem_inits (void)
   }
 
   /* We want gpgrt's gettext to always output UTF-8. */
+#if GPGRT_VERSION_NUMBER >= 0x013300 /* >= 1.51 */
+  gettext_use_utf8 (3);
+#else
   gettext_use_utf8 (1);
+#endif
 #endif
 
   _gpgme_debug_subsystem_init ();