Use pipe2 in Subprocess; platform-specific config
Summary: We've wanted to use pipe2 in Subprocess for a while, but that's not supported on glibc 2.5.1. This is not a problem in OSS (autoconf can solve this), but, internally, we don't run autoconf; add an internal platform include file with such per-platform differences. Test Plan: fbconfig -r folly && fbmake runtests_opt Reviewed By: meyering@fb.com Subscribers: jhj, lesha, kma, agallagher FB internal diff: D1422128
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