Add dawn-mac-x86-deps-rel to mb_config.pyl.

Forgotten in the most recent CL.

Bug: 948902
Change-Id: Ic72688b98721fe6081c6902849ae2852c2b7fdc1
Tbr: martiniss@chromium.org
No-Try: True
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1562795
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649757}
1 file changed