syscall: fix arm networking

Suggested by fango (fan.howard@gmail.com)

R=r, r2
CC=golang-dev
https://golang.org/cl/2514041

src/pkg/syscall/ztypes_linux_arm.go

@@ -2,9 +2,10 @@
 
 // MACHINE GENERATED - DO NOT EDIT.
 
-// Manual corrections: UGH
+// Manual corrections: TODO(rsc): need to fix godefs
 //	remove duplicate PtraceRegs type
 //	change RawSockaddrUnix field to Path [108]int8 (was uint8()
+//  add padding to EpollEvent
 
 package syscall
 
@@ -290,6 +291,7 @@ type Ustat_t struct {
 
 type EpollEvent struct {
 	Events uint32
+	PadFd  int32
 	Fd     int32
 	Pad    int32
 }