Fix dependencies

vendor/golang.org/x/net/ipv4/zsys_openbsd.go

@@ -1,30 +0,0 @@
-// Code generated by cmd/cgo -godefs; DO NOT EDIT.
-// cgo -godefs defs_openbsd.go
-
-package ipv4
-
-const (
-	sysIP_OPTIONS     = 0x1
-	sysIP_HDRINCL     = 0x2
-	sysIP_TOS         = 0x3
-	sysIP_TTL         = 0x4
-	sysIP_RECVOPTS    = 0x5
-	sysIP_RECVRETOPTS = 0x6
-	sysIP_RECVDSTADDR = 0x7
-	sysIP_RETOPTS     = 0x8
-	sysIP_RECVIF      = 0x1e
-	sysIP_RECVTTL     = 0x1f
-
-	sysIP_MULTICAST_IF    = 0x9
-	sysIP_MULTICAST_TTL   = 0xa
-	sysIP_MULTICAST_LOOP  = 0xb
-	sysIP_ADD_MEMBERSHIP  = 0xc
-	sysIP_DROP_MEMBERSHIP = 0xd
-
-	sizeofIPMreq = 0x8
-)
-
-type ipMreq struct {
-	Multiaddr [4]byte /* in_addr */
-	Interface [4]byte /* in_addr */
-}