Build

Stop depending on `avrt.dll` statically on Windows #74

Job	Run time
build (stable, ubuntu-20.04, Release)	46s
build (stable, ubuntu-20.04, Debug)	39s
build (stable, windows-2019, Release)	45s
build (stable, windows-2019, Debug)	44s
build (stable, macos-10.15, Release)	1s
build (stable, macos-10.15, Debug)	1s
build (nightly, ubuntu-20.04, Release)	1m 1s
build (nightly, ubuntu-20.04, Debug)	31s
build (nightly, windows-2019, Release)	33s
build (nightly, windows-2019, Debug)	33s
build (nightly, macos-10.15, Release)	1s
build (nightly, macos-10.15, Debug)	1s
	5m 36s

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