[PATCH] Introduce _LIBCPP_ABI_UNSTABLE to libc++

[Marshall Clow]

Added support for lit and CMAKE - thanks to ErikWF for these bits


http://reviews.llvm.org/D6712

Files:
  CMakeLists.txt
  include/__config
  include/string
  test/CMakeLists.txt
  test/lit.cfg
  test/lit.site.cfg.in

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