fix gcc-5 build
Summary: ```lang=bash folly/test/SmallLocksBenchmark.cpp:212:18: error: use of undeclared identifier 'sqrt' double stdev = sqrt(accum / (results.size() - 1)); ^ folly/test/SmallLocksBenchmark.cpp:221:20: error: use of undeclared identifier 'sqrt' double stddev2 = sqrt(variance); ^ 2 errors generated. ``` Add the missing header. Reviewed By: yfeldblum Differential Revision: D4386343 fbshipit-source-id: 79c3dcae32c62f9b6d162862deabccf5fea7eaef
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