x11-base/xwayland: Update to 1.20.1.

BUG=chromium:837073
TEST=emerge-tatl xwayland

Change-Id: Ie5e04fe65ccdf285ca61817532c1004aed09e71c
Reviewed-on: https://chromium-review.googlesource.com/1244577
Commit-Ready: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
7 files changed