support "#!/bin/busybox"-style wrappers. Needed for SELinux.

Patch by Yuichi Nakamura <ynakam@hitachisoft.jp>

applets/applets.c

@@ -600,9 +600,10 @@ static int busybox_main(char **argv)
 		/* "busybox <applet> arg1 arg2 ..." */
 		argv++;
 	}
-	/* we want "<argv[0]>: applet not found", not "busybox: ..." */
-	applet_name = argv[0];
-	run_applet_and_exit(argv[0], argv);
+	/* We support "busybox /a/path/to/applet args..." too. Allows for
+	 * "#!/bin/busybox"-style wrappers */
+	applet_name = bb_get_last_path_component(argv[0]);
+	run_applet_and_exit(applet_name, argv);
 	bb_error_msg_and_die("applet not found");
 }