add folly::void_t like C++17's std::void_t
Summary: C++17 is adding std::void_t. It's handy for controlling class template partial specialization. Folly should have it too. See http://en.cppreference.com/w/cpp/types/void_t Reviewed By: yfeldblum Differential Revision: D4387302 fbshipit-source-id: 85f955f3d8cfacbd6c9e61fb3f5cf53c056459bb
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