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

samples/propgrid/propgrid.cpp

@@ -2784,7 +2784,7 @@ void FormMain::OnAbout(wxCommandEvent& WXUNUSED(event))
             wxT("Jaakko Salli"), wxVERSION_STRING
             );
 
-    wxMessageBox(msg, _T("About"), wxOK | wxICON_INFORMATION, this);
+    wxMessageBox(msg, wxT("About"), wxOK | wxICON_INFORMATION, this);
 }
 
 // -----------------------------------------------------------------------