[tor-bugs] #28248 [Core Tor/Tor]: Add comments around rust compilation flags

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#28248: Add comments around rust compilation flags
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     Reporter:  nickm         |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:  #28244
       Points:                |   Reviewer:
      Sponsor:                |
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 In particular, we should make sure that all the new and changed items in
 https://github.com/torproject/tor/pull/381 have explanatory comments.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28248>
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