[tor-bugs] #25549 [Core Tor/Tor]: Add tor CI config for AppVeyor

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#25549: Add tor CI config for AppVeyor
-------------------------------------------------+-------------------------
 Reporter:  isis                                 |          Owner:  saper
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.4.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-ci, tor-testing, 034-roadmap-    |  Actual Points:
  subtask, 034-triage-20180328,                  |
  034-included-20180328                          |
Parent ID:  #25550                               |         Points:  2
 Reviewer:  isis, catalyst                       |        Sponsor:
                                                 |  Sponsor3
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Comment (by saper):

 Don't be sorry, it's fun!

 I have pushed some improvements for IRC to my branch on top of your
 changes. Now trying to fight openssl. Interestingly, without pacman
 running we still get OpenSSL from _somewhere_. Jumping into RDP to figure
 out from where exactly it is coming (looks like mingw has it preinstalled)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/25549#comment:25>
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