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/dynarray.h

@@ -42,7 +42,10 @@
  callback compare function for quick sort
  must return negative value, 0 or positive value if pItem1 <, = or > pItem2
  */
+extern "C"
+{
 typedef int (wxCMPFUNC_CONV *CMPFUNC)(const void* pItem1, const void* pItem2);
+}
 
 // ----------------------------------------------------------------------------
 /**