code review 218042: syscall: minimal mingw version of syscall to call windo...

src/pkg/syscall/zerrors_mingw_386.go

 // mkerrors_nacl.sh /home/rsc/pub/nacl/native_client/src/trusted/service_runtime/include/sys/errno.h
 // MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
 
 package syscall
 
 // TODO(brainman): populate errors in zerrors_mingw.go
 
 const (
         EMINGW = 99 /* otherwise unused */
 )
 
 // Error table
 var errors = [...]string{
         EMINGW: "not supported by windows",
 }