[PATCH] [libcxxabi] Document the standalone build's requirements on llvm-config and llvm sources.

[Eric Fiselier]

Implement jroelofs's suggestions. I now use `-DLLVM_SOURCE=path/to/llvm-source-root`. The error message produced my CMake is also more informative.

http://reviews.llvm.org/D5836

Files:
  CMakeLists.txt
  www/index.html
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