replace wx_{const,static,reinterpret}_cast with their standard C++ equivalents

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56644 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/aboutdlg.cpp

@@ -71,7 +71,7 @@ public:
     {
 #if !wxUSE_UNICODE_UTF8
         for ( size_t n = 0; n < m_count; n++ )
-            free(wx_const_cast(gchar *, m_strings[n]));
+            free(const_cast<gchar *>(m_strings[n]));
 #endif
 
         delete [] m_strings;