[PATCH] [libc++] Allow libc++ to be built on systems without POSIX threads

[Jon Roelofs]

Separate out the two halves of __call_once as per EricWF's suggestion, and address my own review comment (about having forgotten a section).

http://reviews.llvm.org/D3969

Files:
  include/__config
  include/__mutex_base
  include/atomic
  include/condition_variable
  include/future
  include/memory
  include/mutex
  include/shared_mutex
  include/thread
  src/algorithm.cpp
  src/condition_variable.cpp
  src/debug.cpp
  src/future.cpp
  src/memory.cpp
  src/mutex.cpp
  src/shared_mutex.cpp
  src/thread.cpp
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