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

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L2898: 	RTM_DELMULTICAST                            = 0x39

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