[GHC] #3268: implement the Cabal ${pkgroot} spec extension

[GHC]

#3268: implement the Cabal ${pkgroot} spec extension
------------------------------+---------------------------------------------
  Reporter:  duncan           |          Owner:                  
      Type:  feature request  |         Status:  new             
  Priority:  normal           |      Milestone:  6.14.1          
 Component:  Package system   |        Version:  6.10.2          
Resolution:                   |       Keywords:                  
Difficulty:  Unknown          |             Os:  Unknown/Multiple
  Testcase:                   |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown     |  
------------------------------+---------------------------------------------
Changes (by igloo):

  * failure:  => None/Unknown
  * milestone:  6.12.1 => 6.14.1

Comment:

 See also #3072.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3268#comment:4>
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