open with O_CLOEXEC #286

Job	Run time
cargo-deny (advisories)	23s
lint	57s
cargo-deny (bans licenses sources)	24s
aarch64-unknown-linux-gnu / build	1m 3s
aarch64-apple-darwin / build	4h 5m 45s
aarch64-unknown-linux-musl / build	1m 30s
aarch64-apple-ios / build	1m 50s
arm-linux-androideabi / build	45s
armv7-linux-androideabi / build	57s
i686-pc-windows-msvc / build	4m 8s
i686-pc-windows-gnu / build	3m 53s
i686-unknown-linux-gnu / build	1m 27s
i686-unknown-linux-musl / build	1m 41s
msrv / build	5m 54s
x86_64-apple-darwin / build	1m 39s
x86_64-pc-windows-gnu / build	4m 26s
x86_64-pc-windows-msvc / build	4m 42s
x86_64-unknown-freebsd / build	39s
x86_64-unknown-linux-gnu / build	1m 40s
x86_64-unknown-linux-musl / build	1m 48s
x86_64-unknown-netbsd / build	29s
	4h 46m 0s

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