This will prevent symbol collision with X11. This fixes the
build integration with Skia.

Bug: angleproject:2621
Bug: angleproject:5416
Change-Id: I6949a375cf9fcdd790b4c40ffb82c7c25bc15315
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2567644
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>