[PATCH] [libcxx] Add support for building and testing with an ABI library not along linker paths

[Eric Fiselier]

Update and merge the patch with changes already upstream.

http://reviews.llvm.org/D5038

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