Allow "busybox <applet>" to work when busybox is disabled

A recent commit made it possible to disable BusyBox's --install
and --list options.  However it also stopped "busybox <applet>
<params>" from working.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

libbb/appletlib.c

@@ -956,6 +956,10 @@ int main(int argc UNUSED_PARAM, char **argv)
 #else
 	lbb_prepare("busybox" IF_FEATURE_INDIVIDUAL(, argv));
 
+#if !ENABLE_BUSYBOX
+	if (argv[1] && is_prefixed_with(bb_basename(argv[0]), "busybox"))
+		argv++;
+#endif
 	applet_name = argv[0];
 	if (applet_name[0] == '-')
 		applet_name++;