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/checkbox.cpp

@@ -67,7 +67,7 @@ static void gtk_checkbox_toggled_callback(GtkWidget *widget, wxCheckBox *cb)
             }
             else
             {
-                wxFAIL_MSG(_T("3state wxCheckBox in unexpected state!"));
+                wxFAIL_MSG(wxT("3state wxCheckBox in unexpected state!"));
             }
 
             cb->GTKEnableEvents();