feat: EventFd type (#1945) #12

Job	Run time
minver	18s
rust_stable	1m 5s
macos	1m 46s
linux_native_builds (x86_64-unknown-linux-gnu)	1m 27s
linux_native_builds (x86_64-unknown-linux-musl)	1m 13s
rustfmt	14s
tier3 (x86_64-unknown-dragonfly)	1m 1s
tier3 (x86_64-unknown-openbsd)	57s
tier3 (x86_64-unknown-haiku)	59s
tier3 (i686-unknown-hurd-gnu)	1m 7s
redox	41s
cross_compiling (aarch64-linux-android)	34s
cross_compiling (arm-linux-androideabi)	37s
cross (arm-unknown-linux-gnueabi)	1m 43s
cross_compiling (armv7-linux-androideabi)	33s
cross (armv7-unknown-linux-gnueabihf)	1m 46s
cross_compiling (i686-linux-android)	33s
cross (i686-unknown-linux-gnu)	1m 38s
cross_compiling (x86_64-linux-android)	35s
cross (i686-unknown-linux-musl)	1m 52s
cross_compiling (arm-unknown-linux-musleabi)	39s
cross (mips-unknown-linux-gnu)	1m 36s
cross_compiling (x86_64-unknown-fuchsia)	25s
cross (mips64-unknown-linux-gnuabi64)	1m 43s
cross_compiling (x86_64-unknown-illumos)	25s
cross (mips64el-unknown-linux-gnuabi64)	1m 37s
cross_compiling (aarch64-apple-ios, true)	33s
cross (mipsel-unknown-linux-gnu)	1m 45s
cross (powerpc64le-unknown-linux-gnu)	1m 31s
cross_compiling (powerpc64-unknown-linux-gnu)	38s
cross_compiling (s390x-unknown-linux-gnu)	35s
cross_compiling (x86_64-unknown-linux-gnux32)	34s
cross_compiling (x86_64-unknown-netbsd)	27s
	33m 7s

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