runtime: revise openbsd/arm runtime defs

The OpenBSD arm port switched to EABI in September 2016 - this revises the layout
of the runtime definitions to match what the kernel currently uses.

Change-Id: I1bca7de56979f576862a7c280631e835f7ae4278
Reviewed-on: https://go-review.googlesource.com/c/153577Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/runtime/defs_openbsd_arm.go

@@ -130,8 +130,9 @@ type stackt struct {
 }
 
 type timespec struct {
-	tv_sec  int64
-	tv_nsec int32
+	tv_sec    int64
+	tv_nsec   int32
+	pad_cgo_0 [4]byte
 }
 
 func (ts *timespec) set_sec(x int64) {
@@ -143,8 +144,9 @@ func (ts *timespec) set_nsec(x int32) {
 }
 
 type timeval struct {
-	tv_sec  int64
-	tv_usec int32
+	tv_sec    int64
+	tv_usec   int32
+	pad_cgo_0 [4]byte
 }
 
 func (tv *timeval) set_usec(x int32) {
@@ -157,10 +159,12 @@ type itimerval struct {
 }
 
 type keventt struct {
-	ident  uint32
-	filter int16
-	flags  uint16
-	fflags uint32
-	data   int64
-	udata  *byte
+	ident     uint32
+	filter    int16
+	flags     uint16
+	fflags    uint32
+	pad_cgo_0 [4]byte
+	data      int64
+	udata     *byte
+	pad_cgo_1 [4]byte
 }