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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