Fix Build: folly with -Wmissing-braces
Summary: [Folly] Fix Build: `folly` with `-Wmissing-braces`. Construction of `std::array` with list-initialization for the contained C array requires double braces, per the standard. Compilers accept it with single braces, but will reject it when `-Wmissing-braces` is passed. Reviewed By: igorsugak, meyering Differential Revision: D4202629 fbshipit-source-id: e5b87a655e7f25e6cddb931dda28b172c768f227
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