Build HarfBuzz with multi-thread support.

Change-Id: I0d0061aaa37c49ca108203df955318f4481db874
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206916
Commit-Queue: Ben Wagner <bungeman@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
1 file changed