kjellander a7584c9f75 iOS: Add mb_type config for GYP builders.
Our first build that passed the configuration reading step
failed because of the $(goma_dir) variable. I compared the JSON and
the recipes between ours and the builders in chromium.mac and this was
the only thing I could easily identify, so I'm going to try it out.

Example failing build: https://build.chromium.org/p/client.webrtc.fyi/builders/iOS64%20Simulator%20Debug/builds/97

BUG=chromium:498746
NOTRY=True
TBR=smut@google.com

Review URL: https://codereview.webrtc.org/1693503002

Cr-Commit-Position: refs/heads/master@{#11573}
2016-02-11 13:36:05 +00:00
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