Supress wxLocale warnings when no matching locale found when setting default locale on MacOS

Re-fixes warning appearing in https://gitlab.com/kicad/code/kicad/-/issues/13371#note_1238532117

common/pgm_base.cpp

@@ -396,6 +396,7 @@ bool PGM_BASE::InitPgm( bool aHeadless, bool aSkipPyInit, bool aIsUnitTest )
 {
 #if defined( __WXMAC__ )
     // Set the application locale to the system default
+    wxLogNull noLog;
     wxLocale loc;
     loc.Init();
 #endif