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[libcxx] Only declare contents of threading API when…

Authored by DavidSpickett on Aug 21 2019, 8:38 AM.

Description

[libcxx] Only declare contents of threading API when _LIBCPP_HAS_THREAD_API_EXTERNAL is not defined.

When it is defined they will be declared by the
__external_threading header instead.

Differential revision: https://reviews.llvm.org/D66518

llvm-svn: 369537