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Some internal methods use wl_proxy_get_version and
wl_proxy_marshal_constructor_versioned that were defined in
libwayland 1.10. However, we fail to resolve to map with these
symbols when Chromium is run against older versions and that
results in failures.

Thus, fix that by checking if these exist by redeclaring them
with weak function attribute.

Bug: 1123005
Change-Id: I4407e0a6917f951b0ccfe3f9ffd366bc64dc9838
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379917Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#802714}