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/html/htmltag.cpp

@@ -332,7 +332,9 @@ wxString wxHtmlTag::GetParam(const wxString& par, bool with_commas) const
         return m_ParamValues[index];
 }
 
-int wxHtmlTag::ScanParam(const wxString& par, wxChar *format, void *param) const
+int wxHtmlTag::ScanParam(const wxString& par,
+                         const wxChar *format,
+                         void *param) const
 {
     wxString parval = GetParam(par);
     return wxSscanf(parval, format, param);