busybox: use bash for gen_build_files.sh to avoid printf argument list issues on some systems

SVN-Revision: 28849

package/busybox/patches/141-gen_build_files_bash.patch

@@ -0,0 +1,8 @@
+--- a/scripts/gen_build_files.sh
++++ b/scripts/gen_build_files.sh
+@@ -1,4 +1,4 @@
+-#!/bin/sh
++#!/usr/bin/env bash
+ 
+ # Note: was using sed OPTS CMD -- FILES
+ # but users complain that many sed implementations