[PATCH] [libcxx] Teach libcxx's lit configuration new ways to find lit.site.cfg

[Eric Fiselier]

Address @danalbert's comments. I also sneaked in the removal of `config.python_executable` which is entirely unused.


http://reviews.llvm.org/D6255

Files:
  CMakeLists.txt
  test/CMakeLists.txt
  test/lit.cfg
  test/lit.site.cfg.in
  www/index.html

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