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This is needed since some distros do not have libwayland-client
available.  If systems don't have libwayland-client, they definitely
won't have a wayland server either, so it doesn't make sense to
statically link libwayland-client, which won't make wayland work and
will only waste binary size.  Instead, this CL dynamically loads
libwayland-client if available.

Also, this CL includes some misc fixes to fix the 'ninja all' build
for Linux/ozone.

R=msisov

Bug: 1126894
Change-Id: Ice0fd0b113f5d804cd05089bfad54168d94c53e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416941
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#810784}