Fixes highly intermittent CaR linux64 builds caused by
code_cache_generator failing to load libx11.so.6 at runtime
Blink has a wide x11 dependency set... rather than patch one lib at a
time as done previously in Bug 1989677, this patch adds a fuller set of
x11 runtime libs.
Differential Revision: https://phabricator.services.mozilla.com/D307899