fixes for the compilation warnings with Sun CC:

1. some fixes for "String literal to char * conversion" warnings (many
   more left in the *.xpm files)
2. fixes for "assignment of function to extern "C" function"
3. a few other miscellaneous ones


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13478 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/resource.cpp

@@ -2049,7 +2049,7 @@ wxChar* wxResourceParseWord(wxChar*s, int *i)
 
 struct wxResourceBitListStruct
 {
-    wxChar *word;
+    const wxChar *word;
     long bits;
 };