Use locale name directly for Windows Vista and later

Instead of combining the language, country and codepage and passing the
resulting string to setlocale(), the locale name can be used instead for
setlocale() on Windows Vista and onwards.

Closes https://github.com/wxWidgets/wxWidgets/pull/358

This fixes a crash that occurs when switching locale from Korean to
Norwegian Bokmål, since the language_country.codepage string resolves to
"Norwegian Bokmål_Norway.1252" and mbstowcs trips up on the non-ASCII
character.

src/common/intl.cpp

@@ -49,6 +49,10 @@
 #ifdef __WIN32__
     #include "wx/dynlib.h"
     #include "wx/msw/private.h"
+
+    #ifndef LOCALE_SNAME
+    #define LOCALE_SNAME 0x5c
+    #endif
 #endif
 
 #include "wx/file.h"
@@ -147,6 +151,19 @@ wxString wxLanguageInfo::GetLocaleName() const
 
     wxChar buffer[256];
     buffer[0] = wxT('\0');
+    if ( wxGetWinVersion() >= wxWinVersion_Vista )
+    {
+        if ( ::GetLocaleInfo(lcid, LOCALE_SNAME, buffer, WXSIZEOF(buffer)) )
+        {
+            locale << buffer;
+        }
+        else
+        {
+            wxLogLastError(wxT("GetLocaleInfo(LOCALE_SNAME)"));
+        }
+        return locale;
+    }
+
     if ( !::GetLocaleInfo(lcid, LOCALE_SENGLANGUAGE, buffer, WXSIZEOF(buffer)) )
     {
         wxLogLastError(wxT("GetLocaleInfo(LOCALE_SENGLANGUAGE)"));