Update

vendor/golang.org/x/sys/unix/syscall_openbsd.go

@@ -300,6 +300,10 @@ func Uname(uname *Utsname) error {
 //sys	Pathconf(path string, name int) (val int, err error)
 //sys	pread(fd int, p []byte, offset int64) (n int, err error)
 //sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
+//sys	readv(fd int, iovecs []Iovec) (n int, err error)
+//sys	writev(fd int, iovecs []Iovec) (n int, err error)
+//sys	preadv(fd int, iovecs []Iovec, offset int64) (n int, err error)
+//sys	pwritev(fd int, iovecs []Iovec, offset int64) (n int, err error)
 //sys	read(fd int, p []byte) (n int, err error)
 //sys	Readlink(path string, buf []byte) (n int, err error)
 //sys	Readlinkat(dirfd int, path string, buf []byte) (n int, err error)