171c8e80b1
Summary: Update dependencies and fix broken clang symlink version changes ``` zstd 0.4.7 => 0.5.1 jemalloc 4.0.3 => master ``` Test Plan: make check -j64 USE_CLANG=1 make check -j64 ROCKSDB_FBCODE_BUILD_WITH_481=1 make check -j64 Reviewers: sdong, yhchiang, anthony, andrewkr Subscribers: dhruba Differential Revision: https://reviews.facebook.net/D55179