wayland: upgraded package to upstream

Upgraded dev-libs/wayland to version 1.15.0.

BUG=chromium:837073
TEST=crosvm can access wayland socket with absolute path.
CQ-DEPEND=CL:1217145

Change-Id: I611db20e34fac1a9cedd1625d7fbdd0a34be438c
Reviewed-on: https://chromium-review.googlesource.com/1213779
Commit-Ready: David Riley <davidriley@chromium.org>
Tested-by: David Riley <davidriley@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
5 files changed