Add in a patch to make busybox use the normal pwd.h and grp.h

functions.  Add in simple implementations of these functions,
which can, optionally, be used instead of the system versions.
 -Erik

id.c

@@ -23,8 +23,6 @@
 #include "busybox.h"
 #include <stdio.h>
 #include <unistd.h>
-#include <pwd.h>
-#include <grp.h>
 #include <getopt.h>
 #include <sys/types.h>