[Bug 57610] No windows are shown when using a dual monitor setup

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57610

--- Comment #25 from Rémi Bernon  ---
Created attachment 77797
  --> https://bugs.winehq.org/attachment.cgi?id=77797
Tentative fix

To fix this within the code freeze, I think the attached patch could perhaps do
the trick. As XRRGetOutputPrimary seems unreliable, calling it only once per
enumeration should make things consistent enough.