cmake: pass "-msse4.2" to when building crc32c.cc if HAVE_SSE42
Summary: it turns out that, with older GCC shipped from centos7, the SSE42 intrinsics are not available even with "target" specified. so we need to pass "-msse42" for checking compiler's sse4.2 support and for building crc32c.cc which uses sse4.2 intrinsics for crc32. Signed-off-by: NKefu Chai <tchaikov@gmail.com> Closes https://github.com/facebook/rocksdb/pull/2950 Differential Revision: D6032298 Pulled By: siying fbshipit-source-id: 124c946321043661b3fb0a70b6cdf4c9c5126ab4
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