Add missing Fanotify APIs from the libc crate into Nix. #1630

Job	Run time
macos-aarch64	1m 45s
macos	2m 33s
linux_native_builds (x86_64-unknown-linux-gnu)	2m 4s
minver	13s
linux_native_builds (x86_64-unknown-linux-musl)	1m 57s
rust_stable	1m 25s
rustfmt	11s
solaris (x86_64-pc-solaris)	3m 41s
tier3 (x86_64-unknown-dragonfly)	1m 0s
tier3 (x86_64-unknown-openbsd)	1m 3s
tier3 (x86_64-unknown-haiku)	57s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 13s
redox	43s
cross (arm-unknown-linux-gnueabi)	1m 52s
cross_compiling (aarch64-linux-android)	39s
cross (armv7-unknown-linux-gnueabihf)	1m 55s
cross_compiling (arm-linux-androideabi)	38s
cross (i686-unknown-linux-gnu)	1m 57s
cross_compiling (armv7-linux-androideabi)	38s
cross (i686-unknown-linux-musl)	2m 3s
cross_compiling (i686-linux-android)	37s
cross (mips-unknown-linux-gnu)	1m 54s
cross_compiling (x86_64-linux-android)	40s
cross (mips64-unknown-linux-gnuabi64)	2m 2s
cross_compiling (arm-unknown-linux-musleabi)	41s
cross (mips64el-unknown-linux-gnuabi64)	1m 54s
cross_compiling (x86_64-unknown-fuchsia)	31s
cross (mipsel-unknown-linux-gnu)	1m 55s
cross_compiling (x86_64-unknown-illumos)	32s
cross (powerpc64le-unknown-linux-gnu)	1m 52s
cross_compiling (aarch64-apple-ios, true)	33s
cross (loongarch64-unknown-linux-gnu)	1m 50s
cross_compiling (powerpc64-unknown-linux-gnu)	39s
cross_compiling (s390x-unknown-linux-gnu)	41s
cross_compiling (x86_64-unknown-linux-gnux32)	44s
cross_compiling (x86_64-unknown-netbsd)	34s
	46m 6s

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