Add MSG_CONFIRM and MSG_DONTROUTE to RecvFlags #1023

Job	Run time
Check (armv7-sony-vita-newlibeabihf)	32s
Check (aarch64-apple-ios)	18s
Clippy	6s
Check (aarch64-linux-android)	29s
Check (x86_64-apple-darwin)	7s
Check (i686-unknown-hurd-gnu)	32s
Docs (aarch64-apple-ios)	12s
Check (x86_64-unknown-fuchsia)	24s
Docs (aarch64-linux-android)	18s
Check (x86_64-pc-windows-msvc)	8s
Docs (armv7-sony-vita-newlibeabihf)	28s
Docs (x86_64-apple-darwin)	14s
Check (x86_64-pc-solaris)	6s
Docs (x86_64-unknown-fuchsia)	14s
Check (x86_64-unknown-freebsd)	14s
Docs (x86_64-pc-windows-msvc)	12s
Check (x86_64-unknown-illumos)	22s
Docs (x86_64-pc-solaris)	13s
Check (x86_64-unknown-linux-gnu)	7s
Docs (i686-unknown-hurd-gnu)	27s
Docs (x86_64-unknown-freebsd)	12s
Check (x86_64-unknown-linux-musl)	9s
Rustfmt	12s
Docs (x86_64-unknown-illumos)	12s
Check (x86_64-unknown-netbsd)	8s
Check (x86_64-unknown-redox)	7s
Docs (x86_64-unknown-linux-gnu)	11s
Check (armv7-linux-androideabi)	14s
Test (stable)	23s
Docs (x86_64-unknown-linux-musl)	15s
Check (i686-linux-android)	8s
Test (1.63.0)	2m 5s
Docs (x86_64-unknown-netbsd)	13s
Test (beta)	18s
Docs (x86_64-unknown-redox)	13s
Test (nightly)	19s
Docs (armv7-linux-androideabi)	13s
Test (macos)	23s
Docs (i686-linux-android)	14s
Test (windows)	1m 50s
	13m 42s

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