Add from_owned_fd constructor to EventFd #1685

Job	Run time
rust_stable	27s
macos-aarch64	1m 54s
linux_native_builds (x86_64-unknown-linux-gnu)	36s
macos	3m 11s
linux_native_builds (x86_64-unknown-linux-musl)	39s
solaris (x86_64-pc-solaris)	4m 33s
tier3 (x86_64-unknown-dragonfly)	1m 2s
rustfmt	6s
minver	12s
tier3 (x86_64-unknown-openbsd)	1m 0s
tier3 (x86_64-unknown-haiku)	1m 0s
tier3 (armv7-unknown-linux-uclibceabihf)	47s
cross	0s
cross_compiling	0s
redox	0s
	15m 27s

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