const golang.org/x/sys/unix.IPPROTO_MPTCP

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L1564: 	IPPROTO_MPTCP                               = 0x106

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)