mtools: version bump to 4.0.23

Upstream has integrated our patches, and fix a timing error in the lock
logic.  Upgrade to get them all.

BUG=chromium:933818
TEST=precq passes

Change-Id: I84d2d5362e473b72ffc3c762eadeed97922d172f
Reviewed-on: https://chromium-review.googlesource.com/1481101
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Nichols <mikenichols@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Mike Nichols <mikenichols@chromium.org>
7 files changed