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/slider.cpp

@@ -100,7 +100,7 @@ static inline wxEventType GtkScrollTypeToWx(int scrollType)
         eventType = wxEVT_SCROLL_THUMBTRACK;
         break;
     default:
-        wxFAIL_MSG(_T("Unknown GtkScrollType"));
+        wxFAIL_MSG(wxT("Unknown GtkScrollType"));
         eventType = wxEVT_NULL;
         break;
     }