Revert "generate_au_zip: Add unsquashfs, remove bsdiff and bspatch."

This reverts commit 9d29f568992107c0f537dc951a938c49190e305a.

Reason for revert: Need bspatch binary for PaygenBuild* stages.

Original change's description:
> generate_au_zip: Add unsquashfs, remove bsdiff and bspatch.
> 
> We no longer use bsdiff nor bspatch libraries to generate or apply payloads. We
> only use their shared library. This patch removes them from generate_au_zip.py.
> 
> Also we are adding squashfs update support for android container and we need our
> custom unsquashfs to generate the file map of the squashfs image. This patch
> adds it to generate_au_zip.py.
> 
> BUG=none
> TEST=submitted a tryjob
> 
> Change-Id: I027cb75321fbf26047e958a7aace90fe7afc3b4f
> Reviewed-on: https://chromium-review.googlesource.com/644151
> Commit-Ready: Amin Hassani <ahassani@chromium.org>
> Tested-by: Amin Hassani <ahassani@chromium.org>
> Reviewed-by: Dan Erat (OOO Fri-Mon) <derat@chromium.org>

BUG=761271

Change-Id: I4411630537d383cb3e9a88438d12a826bcdea070
Reviewed-on: https://chromium-review.googlesource.com/646812
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Commit-Queue: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
1 file changed