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/list.cpp

@@ -640,7 +640,7 @@ bool wxStringList::Member(const wxChar *s) const
     return FALSE;
 }
 
-static int LINKAGEMODE
+extern "C" int LINKAGEMODE
 wx_comparestrings(const void *arg1, const void *arg2)
 {
   wxChar **s1 = (wxChar **) arg1;