[GHC] #16021: Hadrian: remove/refactor package specific hacks

[GHC]

#16021: Hadrian: remove/refactor package specific hacks
-------------------------------------+-------------------------------------
           Reporter:  davide         |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.3
          Component:  Compiler       |           Version:  8.6.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Hadrian implements a number of package specific hacks (e.g. see #16020).
 Such hacks should be discussed in this ticket and ideally removed or
 refactored.

 Hacks:
 * libffi (#16020)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16021>
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