[PATCH] [libcxxabi] Teach CMake better ways to find the libc++ source directory (and misc cleanup).

[Eric Fiselier]

Address @danalbert's comments.


http://reviews.llvm.org/D7130

Files:
  .gitignore
  CMakeLists.txt
  test/libcxxabi/test/config.py
  test/lit.cfg
  test/lit.site.cfg.in
  www/index.html

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