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

one use

	golang.org/x/sys/unix (current package)
		ztypes_linux.go#L2723: 	BPF_LINK_UPDATE                            = 0x1d

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