Add from_owned_fd constructor to EventFd #1684

Job	Run time
linux_native_builds (x86_64-unknown-linux-gnu)	38s
macos	3m 29s
macos-aarch64	1m 58s
linux_native_builds (x86_64-unknown-linux-musl)	39s
minver	14s
rust_stable	30s
rustfmt	7s
solaris (x86_64-pc-solaris)	4m 2s
tier3 (x86_64-unknown-dragonfly)	1m 1s
tier3 (x86_64-unknown-openbsd)	1m 0s
tier3 (x86_64-unknown-haiku)	59s
tier3 (armv7-unknown-linux-uclibceabihf)	46s
cross_compiling	0s
redox	0s
cross	0s
	15m 23s

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