#6420: Fix a compilation warning in the nis module, for OpenBSD and FreeBSD.

Modules/nismodule.c

@@ -89,7 +89,7 @@ nis_mapname (char *map, int *pfix)
 	return map;
 }
 
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(__OpenBSD__) || defined(__FreeBSD__)
 typedef int (*foreachfunc)(unsigned long, char *, int, char *, int, void *);
 #else
 typedef int (*foreachfunc)(int, char *, int, char *, int, char *);