Add missing Fanotify APIs from the libc crate into Nix. #1634

Job	Run time
minver	13s
macos	3m 25s
macos-aarch64	1m 44s
linux_native_builds (x86_64-unknown-linux-gnu)	2m 23s
linux_native_builds (x86_64-unknown-linux-musl)	2m 0s
rust_stable	1m 30s
rustfmt	12s
solaris (x86_64-pc-solaris)	3m 26s
tier3 (x86_64-unknown-dragonfly)	1m 7s
tier3 (x86_64-unknown-openbsd)	1m 1s
tier3 (x86_64-unknown-haiku)	1m 0s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 12s
redox	42s
cross (arm-unknown-linux-gnueabi)	1m 52s
cross_compiling (aarch64-linux-android)	37s
cross (armv7-unknown-linux-gnueabihf)	1m 52s
cross_compiling (arm-linux-androideabi)	40s
cross (i686-unknown-linux-gnu)	1m 52s
cross_compiling (armv7-linux-androideabi)	38s
cross (i686-unknown-linux-musl)	1m 58s
cross_compiling (i686-linux-android)	39s
cross (mips-unknown-linux-gnu)	1m 56s
cross_compiling (x86_64-linux-android)	41s
cross (mips64-unknown-linux-gnuabi64)	1m 52s
cross_compiling (arm-unknown-linux-musleabi)	41s
cross (mips64el-unknown-linux-gnuabi64)	1m 59s
cross_compiling (x86_64-unknown-fuchsia)	34s
cross (mipsel-unknown-linux-gnu)	2m 6s
cross_compiling (x86_64-unknown-illumos)	33s
cross (powerpc64le-unknown-linux-gnu)	1m 55s
cross_compiling (aarch64-apple-ios, true)	32s
cross (loongarch64-unknown-linux-gnu)	1m 45s
cross_compiling (powerpc64-unknown-linux-gnu)	43s
cross_compiling (s390x-unknown-linux-gnu)	43s
cross_compiling (x86_64-unknown-linux-gnux32)	46s
cross_compiling (x86_64-unknown-netbsd)	37s
	47m 26s

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