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

include/wx/private/fileback.h

@@ -33,7 +33,7 @@ public:
     // backing file is never created and the backing is done with memory.
     wxBackingFile(wxInputStream *stream,
                   size_t bufsize = DefaultBufSize,
-                  const wxString& prefix = _T("wxbf"));
+                  const wxString& prefix = wxT("wxbf"));
 
     wxBackingFile() : m_impl(NULL) { }
     ~wxBackingFile();