Updates to a number of apps to remove warnings/compile errors under libc5.

Tested under both libc5 and libc6 and all seems well with these fixes.
 -Erik

networking/hostname.c

@@ -1,6 +1,6 @@
 /* vi: set sw=4 ts=4: */
 /*
- * $Id: hostname.c,v 1.9 2000/05/19 05:35:18 erik Exp $
+ * $Id: hostname.c,v 1.10 2000/06/19 17:25:39 andersen Exp $
  * Mini hostname implementation for busybox
  *
  * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
@@ -143,5 +143,5 @@ int hostname_main(int argc, char **argv)
 			printf("%s\n", buf);
 		}
 	}
-	exit(0);
+	return(0);
 }