[PATCH] D18174: Fix libcxx build on musl

[Khem Raj via cfe-commits]

raj.khem added a comment.

@bcraig, right, check for __GLIBC__ can be moved after including features.h. 
https://chromium.googlesource.com/native_client/pnacl-libcxx/+/master%5E!/
seems to add needed tweaks which can be enabled by passing -D__musl__ in CFLAGS
may be it can be backported to 3.8 branch


http://reviews.llvm.org/D18174