correcting cast for tiger

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@34003 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dynlib.cpp

@@ -480,7 +480,7 @@ void *dlopen(const char *path, int WXUNUSED(mode) /* mode is ignored */)
 
 int dlclose(void *handle)
 {
-    NSUnLinkModule( handle, NSUNLINKMODULE_OPTION_NONE);
+    NSUnLinkModule( (NSModule) handle, NSUNLINKMODULE_OPTION_NONE);
     return 0;
 }