Merge pull request #1580 from EliahKagan/msys #4747

Job	Run time
check-packetline (ubuntu-latest)	5s
lint	3m 38s
cargo-deny (advisories)	26s
cargo-deny (bans licenses sources)	28s
pure-rust-build	2m 2s
test	14m 39s
test-32bit (armv7-linux-androideabi)	1m 17s
test-fast (windows-latest)	15m 0s
WebAssembly (wasm32-unknown-unknown)	1m 9s
test-fast (macos-latest)	2m 56s
WebAssembly (wasm32-wasi)	45s
test-fast (ubuntu-latest)	3m 49s
Tests pass	1s
	46m 15s

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