Add missing Fanotify APIs from the libc crate into Nix. #1737

Job	Run time
macos	3m 47s
macos-aarch64	2m 38s
minver	12s
linux_native_builds (x86_64-unknown-linux-gnu)	2m 59s
linux_native_builds (x86_64-unknown-linux-musl)	2m 50s
rust_stable	1m 20s
rustfmt	7s
solaris (x86_64-pc-solaris)	3m 57s
tier3 (x86_64-unknown-dragonfly)	1m 0s
tier3 (x86_64-unknown-openbsd)	58s
tier3 (x86_64-unknown-haiku)	55s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 6s
tier3 (i686-unknown-hurd-gnu)	1m 3s
redox	35s
cross (arm-unknown-linux-gnueabi)	2m 1s
cross_compiling (aarch64-linux-android)	39s
cross (armv7-unknown-linux-gnueabihf)	2m 7s
cross (i686-unknown-linux-gnu)	1m 54s
cross_compiling (arm-linux-androideabi)	36s
cross (i686-unknown-linux-musl)	2m 1s
cross_compiling (armv7-linux-androideabi)	43s
cross (mips-unknown-linux-gnu)	1m 53s
cross_compiling (i686-linux-android)	38s
cross (mips64-unknown-linux-gnuabi64)	2m 1s
cross_compiling (x86_64-linux-android)	40s
cross_compiling (arm-unknown-linux-musleabi)	45s
cross (mips64el-unknown-linux-gnuabi64)	2m 6s
cross_compiling (x86_64-unknown-fuchsia)	32s
cross (mipsel-unknown-linux-gnu)	2m 2s
cross (powerpc64le-unknown-linux-gnu)	2m 6s
cross_compiling (x86_64-unknown-illumos)	33s
cross (loongarch64-unknown-linux-gnu)	1m 57s
cross_compiling (aarch64-apple-ios, true)	36s
cross_compiling (powerpc64-unknown-linux-gnu)	40s
cross_compiling (s390x-unknown-linux-gnu)	45s
cross_compiling (x86_64-unknown-linux-gnux32)	42s
cross_compiling (x86_64-unknown-netbsd)	35s
	51m 59s

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