syscall: update BSD variants to sync with new os/signal
R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/5661051
diff --git a/src/pkg/syscall/syscall_openbsd.go b/src/pkg/syscall/syscall_openbsd.go
index adbbf3d..7cd1191 100644
--- a/src/pkg/syscall/syscall_openbsd.go
+++ b/src/pkg/syscall/syscall_openbsd.go
@@ -135,7 +135,7 @@
//sysnb Gettimeofday(tv *Timeval) (err error)
//sysnb Getuid() (uid int)
//sys Issetugid() (tainted bool)
-//sys Kill(pid int, signum int) (err error)
+//sys Kill(pid int, signum Signal) (err error)
//sys Kqueue() (fd int, err error)
//sys Lchown(path string, uid int, gid int) (err error)
//sys Link(path string, link string) (err error)
