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Chromoting is planning to bump up iOS deployment target to 10.0. However,
one of our dependency, //third_party/usrsctp has used some OSAtomic*
functions that have been deprecated on 10.0 SDK.

After some discussions with the usrsctp people, we would like to suppress
the deprecation warning on usrsctp for now because:
* Replacing the OSAtomic* functions with atomic_fetch_add is nontrivial
  and requires replacing some int32_t with _Atomic(int32_t) globally in
  their codebase, which is challenging for an engineer who isn't familiar
  with it.
* The OSAtomic* API works all the way up to deployment target 11, if
  ignoring the warnings.
* Filed a bug in their repo but they don't plan to fix that soon.
* They have already suppressed the warning in their configure.ac file.
  This is replicating their change.

Bug: 774483
Change-Id: Ie7f65edb767cc241a8b5fe7dc6074ef37387d89f
Reviewed-on: https://chromium-review.googlesource.com/726619Reviewed-by: Rohit Rao (ping after 24h) <rohitrao@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Taylor Brandstetter <deadbeef@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509905}