[GHC] #7706: iOS patch no 5: pass host OS and arch to cabal

[GHC]

#7706: iOS patch no 5: pass host OS and arch to cabal
------------------------------+---------------------------------------------
Reporter:  StephenBlackheath  |          Owner:                  
    Type:  bug                |         Status:  new             
Priority:  normal             |      Component:  Compiler        
 Version:  7.7                |       Keywords:                  
      Os:  Unknown/Multiple   |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown       |      Blockedby:                  
Blocking:                     |        Related:                  
------------------------------+---------------------------------------------
 WARNING: If this cabal patch
 (https://github.com/haskell/cabal/issues/1184#issuecomment-13761018 - adds
 --host-os and --host-arch options) isn't applied, then *this patch will
 break all cross compiling*.

 Pass the correct host-os and host-arch values to cabal.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7706>
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