Build

Stop depending on `avrt.dll` statically on Windows #66

Job	Run time
build (stable, ubuntu-20.04, Release)	22s
build (stable, ubuntu-20.04, Debug)	33s
build (stable, windows-2019, Release)	29s
build (stable, windows-2019, Debug)	25s
build (stable, macos-10.15, Release)	1s
build (stable, macos-10.15, Debug)	1s
build (nightly, ubuntu-20.04, Release)	26s
build (nightly, ubuntu-20.04, Debug)	27s
build (nightly, windows-2019, Release)	24s
build (nightly, windows-2019, Debug)	25s
build (nightly, macos-10.15, Release)	1s
build (nightly, macos-10.15, Debug)	1s
	3m 35s

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