Switched to use /usr/bin/env to locate bash instead of using a hard coded path, this allows bash to be located outside of /usr/bin and for /usr/bin to be kept pristine

Build/cmake/gen_filelists.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 basedir="../.."
 file=Build/cmake/FileList.cmake