[Fuzzer] Update build.sh to fix build errors (#65496) Switch from C++11 to C++14 as fuzzer requires std::chrono and stdlibc++ doesn't provide chrono literals when using -std=c++11. Also remove 'u' from ar command to fix this warning: ar: `u' modifier ignored since `D' is the default (see `U') NOKEYCHECK=True GitOrigin-RevId: d3440304b110138770eb1236fba088a9704d9fbc