Deal with _POSIX_SAVED_IDS when relinquishing privileges

$OpenBSD: patch-unix_spawn_c,v 1.2 2003/12/14 01:39:18 naddy Exp $
--- unix/spawn.c.orig	2003-05-29 08:08:49.000000000 +0200
+++ unix/spawn.c	2003-11-11 21:28:58.000000000 +0100
@@ -352,8 +352,10 @@ ixsspawn (pazargs, aidescs, fkeepuid, fk
   if (! fkeepuid)
     {
       /* Return to the uid of the invoking user.  */
-      (void) setuid (getuid ());
+      (void) setegid (getgid ());
       (void) setgid (getgid ());
+      (void) seteuid (getuid ());
+      (void) setuid (getuid ());
     }
   else
     {