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Move to GCC 9 to build on Travis (it is the default GCC version bundled with the LTS version of Ubuntu 20.04).
This resolves the error from the Travis log https://app.travis-ci.com/github/TulipCharts/tulipnode/jobs/529812363#L330 as the command is not available before g++ version 4.9 .
References:
nodejs/node#37935
https://stackoverflow.com/questions/39871129/c-error-unrecognized-command-line-option-std-gnu14