[GHC] #7700: iOS patch no 3: enable/disable terminfo more precisely by os

[GHC]

#7700: iOS patch no 3: enable/disable terminfo more precisely by os
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  Reporter:  StephenBlackheath  |          Owner:  igloo           
      Type:  feature request    |         Status:  patch           
  Priority:  normal             |      Milestone:  7.8.1           
 Component:  Compiler           |        Version:  7.7             
Resolution:                     |       Keywords:                  
        Os:  Unknown/Multiple   |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown       |     Difficulty:  Unknown         
  Testcase:                     |      Blockedby:                  
  Blocking:  7724               |        Related:                  
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Comment(by StephenBlackheath):

 I completed a darwin -> iOS cross build successfully with this patch, so
 there's a good chance the potential slight change in ordering of
 BUILD_DIRS is OK.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7700#comment:13>
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