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

include/wx/html/htmltag.h

@@ -107,7 +107,7 @@ public:
     // (like sscanf() does)
     // NOTE: unlike scanf family, this function only accepts
     //       *one* parameter !
-    int ScanParam(const wxString& par, wxChar *format, void *param) const;
+    int ScanParam(const wxString& par, const wxChar *format, void *param) const;
 
     // Returns string containing all params.
     wxString GetAllParams() const;