removed copystring function already defined in common wx utilities

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11567 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

utils/HelpGen/src/wx_extra_imps.cpp

@@ -13,18 +13,6 @@
     #include "wx/defs.h"
 #endif
 
-char *
-copystring (const char *s)
-{
-  if (s == NULL) s = "";
-  size_t len = strlen (s) + 1;
-
-  char *news = new char[len];
-  memcpy (news, s, len);    // Should be the fastest
-
-  return news;
-}
-
 #ifdef __WXMSW__
 // from filefn.cpp
 void WXDLLEXPORT wxSplitPath(const char *pszFileName,