Silence spurious Werror=maybe-uninitialized in transliterateImpl

only seen in optimised build

Change-Id: Ibf344efa034feefdc6e03d489a0a6b28461b76e2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/124581
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

i18npool/source/transliteration/transliteration_body.cxx

@@ -16,6 +16,10 @@
  *   except in compliance with the License. You may obtain a copy of
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
+// Silence spurious Werror=maybe-uninitialized in transliterateImpl emitted at least by GCC 11.2.0
+#if defined __GNUC__ && !defined __clang__
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
 
 #include <rtl/ref.hxx>
 #include <i18nutil/casefolding.hxx>