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

coreutils/basename.c

@@ -60,6 +60,6 @@ extern int basename_main(int argc, char **argv)
 			s[m-n] = '\0';
 	}
 	printf("%s\n", s);
-	exit(TRUE);
+	return(TRUE);
 }