[PATCH] [libcxx] Set -D_LIBCPP_HAS_NO_THREADS and -D_LIBCPP_HAS_NO_MONOTONIC_CLOCK based on available_features

[Jon Roelofs]

Looks like they do end up with weird whitespace in that case... So strip them on the way in.

http://reviews.llvm.org/D5214

Files:
  lit.cfg
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