Build

Stop depending on `avrt.dll` statically on Windows #77

Job	Run time
build (stable, ubuntu-20.04, Release)	54s
build (stable, ubuntu-20.04, Debug)	44s
build (stable, windows-2019, Release)	1m 59s
build (stable, windows-2019, Debug)	1m 40s
build (stable, macos-10.15, Release)	1s
build (stable, macos-10.15, Debug)	1s
build (nightly, ubuntu-20.04, Release)	33s
build (nightly, ubuntu-20.04, Debug)	37s
build (nightly, windows-2019, Release)	40s
build (nightly, windows-2019, Debug)	43s
build (nightly, macos-10.15, Release)	1s
build (nightly, macos-10.15, Debug)	1s
	7m 54s

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