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

[Eric Fiselier]

Added documentation on how to build libc++ against a non-installed ABI library.

Unfortunately not only does the user have to pass `-DCMAKE_LIBRARY_PATH=/path/to/lib` to CMake, but they also need to set `RPATH=/path/to/lib` when building libc++.
CMake does not have a mechanism for configuring relative paths via CMake variable. 

We could manually add `-Wl,-rpath -Wl,<lib-path>` for all paths in `CMAKE_LIBRARY_PATH` but this also seems less than ideal.

http://reviews.llvm.org/D5038

Files:
  CMakeLists.txt
  cmake/HandleLibCXXABI.cmake
  cmake/config-ix.cmake
  lib/CMakeLists.txt
  test/lit.cfg
  test/lit.site.cfg.in
  www/index.html
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