syscall: linux Tgkill takes a Signal too

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5649089

src/pkg/syscall/syscall_linux.go

@@ -856,7 +856,7 @@ func Mount(source string, target string, fstype string, flags uintptr, data stri
 //sys	Sync()
 //sysnb	Sysinfo(info *Sysinfo_t) (err error)
 //sys	Tee(rfd int, wfd int, len int, flags int) (n int64, err error)
-//sysnb	Tgkill(tgid int, tid int, sig int) (err error)
+//sysnb	Tgkill(tgid int, tid int, sig Signal) (err error)
 //sysnb	Times(tms *Tms) (ticks uintptr, err error)
 //sysnb	Umask(mask int) (oldmask int)
 //sysnb	Uname(buf *Utsname) (err error)

src/pkg/syscall/zsyscall_linux_386.go

@@ -793,7 +793,7 @@ func Tee(rfd int, wfd int, len int, flags int) (n int64, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Tgkill(tgid int, tid int, sig int) (err error) {
+func Tgkill(tgid int, tid int, sig Signal) (err error) {
 	_, _, e1 := RawSyscall(SYS_TGKILL, uintptr(tgid), uintptr(tid), uintptr(sig))
 	if e1 != 0 {
 		err = e1

src/pkg/syscall/zsyscall_linux_amd64.go

@@ -793,7 +793,7 @@ func Tee(rfd int, wfd int, len int, flags int) (n int64, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Tgkill(tgid int, tid int, sig int) (err error) {
+func Tgkill(tgid int, tid int, sig Signal) (err error) {
 	_, _, e1 := RawSyscall(SYS_TGKILL, uintptr(tgid), uintptr(tid), uintptr(sig))
 	if e1 != 0 {
 		err = e1

src/pkg/syscall/zsyscall_linux_arm.go

@@ -793,7 +793,7 @@ func Tee(rfd int, wfd int, len int, flags int) (n int64, err error) {
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
-func Tgkill(tgid int, tid int, sig int) (err error) {
+func Tgkill(tgid int, tid int, sig Signal) (err error) {
 	_, _, e1 := RawSyscall(SYS_TGKILL, uintptr(tgid), uintptr(tid), uintptr(sig))
 	if e1 != 0 {
 		err = e1