[tor-bugs] #22838 [Core Tor/Tor]: Backport mingw warning fix from 0.3.1.

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#22838: Backport mingw warning  fix from 0.3.1.
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 Reporter:  nickm                                |          Owner:
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.0.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  028-backport 029-backport            |  Actual Points:
  030-backport                                   |
Parent ID:                                       |         Points:  .1
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by nickm):

 Fix in branch bug22838_028 . Leaning to "backport to 0.2.8 and forward"
 (that is, to all affected versions) so we can get our CI happy again.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22838#comment:2>
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