[WIP] use gcc -dumpmachine , instead of uname -m , this is mainly check CI #610
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uname -m returns host architecture within docker environment
so if you run arm7v compile on docker/arm64, it returns aarch64, that confuses ros build farm https://build.ros.org/job/Nbin_ufhf_uFhf__euslisp__ubuntu_focal_armhf__binary/