scripts/gen-dependencies.sh: use /bin/sh

This uses no special bash stuff.

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

scripts/gen-dependencies.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 #
 # Copyright (C) 2012 OpenWrt.org
 #