[libcxx][PATCH] Fix for CMakelists.txt

[Howard Hinnant]

I know nothing about the CMake build system.  Please review:

Thanks,
Howard

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The problem is the cmake script for libcxx is broken. I've attached what I think is the right fix for it. It was failing to copy cxxabi.h to the right place because it was generating to destination path like so /include/${dstdir}/ and dstdir can legally be blank from my interpretation of the script, and this would then generate a path like libcxx/include// which is illegal.

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