[PATCH] D18174: Fix libcxx build on musl

[Khem Raj via cfe-commits]

raj.khem added a comment.

3.8 has it in there. So may be this is just not required. I will add 
-DLIBCXX_HAS_MUSL_LIBC=ON to Cmake and see what comes out


http://reviews.llvm.org/D18174