Use an explicit list and don't add X11 dependency to rtc_base.
Allow skipping code that depends on rarer extensions such as Xdamage, Xfixes.
Bug: None
Change-Id: Icb8d20a267358f5cd3f1ff2af31a669e0670d2f6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/140865
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Guido Urdaneta <guidou@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Oleh Prypin <oprypin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28204}
829a5dce90