[GHC] #3178: Fix linking -lpthread for semaphores

[GHC]

#3178: Fix linking -lpthread for semaphores
---------------------------------+------------------------------------------
    Reporter:  sthibaul          |        Owner:         
        Type:  bug               |       Status:  new    
    Priority:  normal            |    Milestone:  _|_    
   Component:  libraries/unix    |      Version:  6.10.2 
    Severity:  normal            |   Resolution:         
    Keywords:                    |   Difficulty:  Unknown
    Testcase:                    |           Os:  Other  
Architecture:  Unknown/Multiple  |  
---------------------------------+------------------------------------------
Changes (by igloo):

  * priority:  low => normal
  * milestone:  6.12.1 => _|_

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3178#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler