fix missing include with gcc 11.1.0

DigitalInBlue / Celero

C++ Benchmark Authoring Library/Framework

Other

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fix missing include with gcc 11.1.0 #160

Closed Enhex closed 3 years ago

Enhex commented 3 years ago

got a missing include. not sure why, maybe i got several compiler installations mixed up. regardless it's good to have it instead of relying on other headers to implicitly include it.