[tor-bugs] #20986 [Core Tor/Tor]: Gracefully handle build configurations on systems without AsciiDoc

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#20986: Gracefully handle build configurations on systems without AsciiDoc
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     Reporter:  cypherpunks   |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 On systems without AsciiDoc the build configuration aborts telling users
 to pass `--disable-asciidoc`. This requires users to restart the build
 configuration which is annoying.

 Instead the build configuration should handle these cases gracefully and
 show a message without aborting the configuration. In these cases i would
 also show a less verbose message and change it to something similar to
 systems without Python, see
 https://gitweb.torproject.org/tor.git/tree/configure.ac?id=4098bfa26073551fe3f525ada7fc9079a49fd4bb#n218.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20986>
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