Add Sctp protocol and MSG_NOTIFICATION #1681

Job	Run time
linux_native_builds (x86_64-unknown-linux-gnu)	37s
macos	53s
linux_native_builds (x86_64-unknown-linux-musl)	39s
macos-aarch64	32s
minver	40s
rustfmt	14s
rust_stable	1m 30s
solaris (x86_64-pc-solaris)	17m 10s
tier3 (x86_64-unknown-dragonfly)	1m 4s
tier3 (x86_64-unknown-openbsd)	1m 1s
tier3 (x86_64-unknown-haiku)	1m 2s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 12s
redox	0s
cross_compiling	0s
cross	0s
	26m 34s

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