Build breaks in third_party benchmark on macos due to new clang v13 warning option
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[ 71%] Building CXX object third_party/benchmark/src/CMakeFiles/benchmark.dir/complexity.cc.o
~/Projects/google/leveldb/third_party/benchmark/src/complexity.cc:86:10: error: variable 'sigma_gn' set but not used [-Werror,-Wunused-but-set-variable]
double sigma_gn = 0.0;
$ gcc --version
Apple clang version 13.1.6 (clang-1316.0.21.2)
Target: arm64-apple-darwin21.4.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
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