Globally replace _T() with wxT().

Standardize on using a single macro across all wxWidgets sources and solve the name clash with Sun CC standard headers (see #10660).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61508 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/settings.cpp

@@ -228,7 +228,7 @@ wxColour wxSystemSettingsNative::GetColour( wxSystemColour index )
 
         case wxSYS_COLOUR_MAX:
         default:
-            wxFAIL_MSG( _T("unknown system colour index") );
+            wxFAIL_MSG( wxT("unknown system colour index") );
             color = *wxWHITE;
             break;
     }