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This CL switches Linux to use in-tree fontconfig builds.  It exposes some leaks
and races detected by LSAN and TSAN.  For now, these will be suppressed since
these issues were preexisting, but instrumenting fontconfig exposed the issues.

R=dnicoara@chromium.org,dpranke@chromium.org
BUG=795110,795148

Change-Id: Ia75db4ced6ec78a5f0610af9ebc78a87840b86f7
Reviewed-on: https://chromium-review.googlesource.com/826403
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524389}