scripts/mkits.sh: switch from bash to sh

This no longer needs bash.

Signed-off-by: Rosen Penev <[email protected]>

scripts/mkits.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 #
 # Licensed under the terms of the GNU GPL License version 2 or later.
 #