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

[Ed Schouten]

In http://reviews.llvm.org/D8703#149206, @EricWF wrote:

> Pretty much, but I would make the test names more descriptive so they infer that these are failure tests for when we have no unsafe C functions. The test names don't *have* to follow the standard names.


Got it. What do you think about the following naming scheme? I've named them `${function}.thread-unsafe.fail.cpp`.


http://reviews.llvm.org/D8703

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