chroot_version_hooks.d: clear our broken arm python lib64 usage

To make sure boards rebuild/reinstall their broken python packages,
forcibly unmerge any installed broken packages that are using lib64.
We're revbumping all the python packages to make sure they get new
versions before cleaning them out.

BUG=chromium:876634
TEST=ran locally and it cleared out a bunch of broken packages

Change-Id: I9222ea3e5c28d93fcd07c042eee0a216ee88df6e
Reviewed-on: https://chromium-review.googlesource.com/1191302
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
1 file changed