x11-libs: Sync with upstream

libX11 1.7.2 -> 1.7.3
gdk-pixbuf 2.42.6 -> 2.42.6-r1

BUG=none
TEST=CQ

Change-Id: I37c8813c79717beb98b71abdcc7a3930621fe5e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3336916
Tested-by: Fergus Dall <sidereal@google.com>
Auto-Submit: Fergus Dall <sidereal@google.com>
Reviewed-by: David Riley <davidriley@chromium.org>
Commit-Queue: David Riley <davidriley@chromium.org>
3 files changed