Omit -pthread option on Darwin The copy of Clang shipped with XCode 9.2 emits a warning when this option is passed. "clang: warning: argument unused during compilation: '-pthread' [-Wunused-command-line-argument]" This makes the build log very noisy, since the warning is emitted for libre2 and every test. Change-Id: I7714e08f66b51a86061016cae26f9b8b4f75ad9a Reviewed-on: https://code-review.googlesource.com/23791 Reviewed-by: Paul Wankadia <junyer@google.com> 
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