[Bug remote/17028] GDB+GDBserver hangs on Windows waiting for stop event since target-async on by default

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17028

--- Comment #6 from Pedro Alves <palves at redhat dot com> ---
I changed the test to loop forever, like:

void
increment (int *i)
{
  *i++;
}

int
main (void)
{
  int i = 0;

 again:
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  increment (&i);
  goto again;
}

And I managed to reproduce it too:

 Sending packet: $vCont;s:9c0;c#5c...
 *hang*

This is on Windows 7, 64-bit, in case we're hitting a Windows bug.

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