[tor-bugs] #7977 [Tor]: Have autoconf detect signed enum

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#7977: Have autoconf detect signed enum
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 Reporter:  nickm                        |          Owner:                    
     Type:  defect                       |         Status:  new               
 Priority:  minor                        |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor                          |        Version:                    
 Keywords:  tor-client cleanup autoconf  |         Parent:                    
   Points:                               |   Actualpoints:                    
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 On MSVC, enums are always signed.  With #7305, we made an ENUM_BF macro to
 avoid problems with signed enums.  But that macro needs to know whether by
 default enum types are signed or not.  It would be better to detect this
 with autoconf than just to check for defined(_MSC)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7977>
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