[tor-bugs] #4437 [Tor Client]: Compile warnings when using --disable-threads

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#4437: Compile warnings when using --disable-threads
------------------------+---------------------------------------------------
 Reporter:  Sebastian   |          Owner:                    
     Type:  defect      |         Status:  new               
 Priority:  normal      |      Milestone:  Tor: 0.2.2.x-final
Component:  Tor Client  |        Version:                    
 Keywords:              |         Parent:                    
   Points:              |   Actualpoints:                    
------------------------+---------------------------------------------------
 When using --disable-threads to compile tor, this warning happens on
 recent GCCs:

 {{{
 log.c:99: error: 'log_mutex' defined but not used
 }}}

 I'm aiming this for 0.2.2.x, but if people feel better about only fixing
 this in master I'm ok too. The merge is conflict-free.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4437>
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