Add MSG_CONFIRM and MSG_DONTROUTE to RecvFlags #1025

Job	Run time
Rustfmt	6s
Check (armv7-sony-vita-newlibeabihf)	28s
Test (stable)	17s
Check (i686-unknown-hurd-gnu)	34s
Check (aarch64-apple-ios)	18s
Test (1.63.0)	2m 4s
Check (aarch64-linux-android)	9s
Test (beta)	20s
Clippy	17s
Check (x86_64-apple-darwin)	14s
Test (nightly)	22s
Docs (aarch64-apple-ios)	15s
Check (x86_64-unknown-fuchsia)	15s
Test (macos)	32s
Docs (aarch64-linux-android)	13s
Docs (armv7-sony-vita-newlibeabihf)	27s
Check (x86_64-pc-windows-msvc)	21s
Test (windows)	1m 32s
Docs (x86_64-apple-darwin)	12s
Docs (i686-unknown-hurd-gnu)	30s
Check (x86_64-pc-solaris)	9s
Docs (x86_64-unknown-fuchsia)	17s
Check (x86_64-unknown-freebsd)	8s
Docs (x86_64-pc-windows-msvc)	13s
Check (x86_64-unknown-illumos)	11s
Docs (x86_64-pc-solaris)	13s
Check (x86_64-unknown-linux-gnu)	13s
Docs (x86_64-unknown-freebsd)	15s
Check (x86_64-unknown-linux-musl)	17s
Docs (x86_64-unknown-illumos)	17s
Check (x86_64-unknown-netbsd)	6s
Docs (x86_64-unknown-linux-gnu)	14s
Check (x86_64-unknown-redox)	16s
Docs (x86_64-unknown-linux-musl)	14s
Check (armv7-linux-androideabi)	9s
Docs (x86_64-unknown-netbsd)	12s
Check (i686-linux-android)	8s
Docs (x86_64-unknown-redox)	14s
Docs (armv7-linux-androideabi)	14s
Docs (i686-linux-android)	12s
	13m 38s

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