[PATCH] [libcxxabi] Add lit configs for libcxxabi tests.

[Dan Albert]

Some cleanup: now uses add_lit_testsuiite(), use find_path() to determine libcxx include directories (which also fixes a bug caused by relative paths).
Address some review comments.

http://reviews.llvm.org/D4414

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