open with O_CLOEXEC #288

Job	Run time
cargo-deny (advisories)	25s
lint	44s
cargo-deny (bans licenses sources)	21s
aarch64-apple-darwin / build	48s
aarch64-apple-ios / build	1m 13s
aarch64-unknown-linux-gnu / build	56s
aarch64-unknown-linux-musl / build	1m 14s
arm-linux-androideabi / build	35s
armv7-linux-androideabi / build	34s
i686-pc-windows-gnu / build	1m 44s
i686-pc-windows-msvc / build	2m 43s
i686-unknown-linux-musl / build	1m 34s
i686-unknown-linux-gnu / build	1m 24s
msrv / build	1m 15s
x86_64-apple-darwin / build	54s
x86_64-pc-windows-gnu / build	2m 54s
x86_64-pc-windows-msvc / build	2m 45s
x86_64-unknown-freebsd / build	40s
x86_64-unknown-linux-gnu / build	1m 24s
x86_64-unknown-linux-musl / build	1m 1s
x86_64-unknown-netbsd / build	34s
	25m 42s

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