sdefresne 60624cd6bf [iOS] Link with base/maccocoathreadhelper.mm on iOS.
rtc::ThreadManager::ThreadManager() calls rtc::InitCocoaMultiThreading()
on iOS so add base/maccocoathreadhelper.mm to the file to build on iOS.

Fixes the following linker error:

Undefined symbols for architecture x86_64:
  "rtc::InitCocoaMultiThreading()", referenced from:
      rtc::ThreadManager::ThreadManager() in librtc_base.a(thread.o)

BUG=459705
NOTRY=True

Review URL: https://codereview.webrtc.org/1810373003

Cr-Commit-Position: refs/heads/master@{#12085}
2016-03-22 10:32:22 +00:00
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