[tor-bugs] #28435 [Core Tor/Tor]: adjust Doxyfile for source tree moves

[Tor Bug Tracker & Wiki]

#28435: adjust Doxyfile for source tree moves
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     Reporter:  catalyst      |      Owner:  catalyst
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.5.1-alpha
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:  0.1           |   Reviewer:
      Sponsor:                |
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 The major source tree rearrangement means that Doxygen doesn't find any
 source files. We should set `RECURSIVE = YES` to fix this. (We could also
 explicitly enumerate all of the directories, but recursing is more future-
 proof.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28435>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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