[PATCH] libc++: Make support for thread-unsafe C functions optional

[Eric Fiselier]

The CMake and LIT stuff LGTM. However I would rather keep the directory structure in test/std the same as the structure of the C++ standard clauses. Could you rename the fail tests, put them in the correct directories and use `// REQUIRES: libcpp-has-no-thread-unsafe-c-functions`?


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http://reviews.llvm.org/D8703

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