Move toolchain from /tools to /tools_${arch}

This will allow us to run multiple builds on the same
system at the same time (or at least have them on disk).

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/stripper

@@ -1,4 +1,4 @@
-#!/tools/bin/bash
+#!/usr/bin/env bash
 
 dirs=""
 excludes="/dev /proc /sys /run"