Add an #ifdef __APPLE__ around typedef of foreachfunc to match Apple's

incorrect declaration for ypall_callback in /usr/include/rpcsvc/ypcInt.h .
Shouldn't hurt any code since the differences are unsigned long instead of int and
void * instead of char *.  Removes warning about improper function pointer
assignment during compilation.

Modules/nismodule.c

@@ -68,7 +68,11 @@ nis_mapname (char *map, int *pfix)
 	return map;
 }
 
+#ifdef __APPLE__
+typedef int (*foreachfunc)(unsigned long, char *, int, char *, int, void *);
+#else
 typedef int (*foreachfunc)(int, char *, int, char *, int, char *);
+#endif
 
 struct ypcallback_data {
 	PyObject	*dict;