target/hexagon/idef-parser/prepare: use env to invoke bash

This file is the only one involved in the compilation process which
still uses the /bin/bash path.

Signed-off-by: Samuel Tardieu <sam@rfc1149.net>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Message-ID: <20231123211506.636533-1-sam@rfc1149.net>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

target/hexagon/idef-parser/prepare

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 #
 #  Copyright(c) 2019-2021 rev.ng Labs Srl. All Rights Reserved.