[GHC] #13412: Centralize the definition for GHC's libdir on Windows

[GHC]

#13412: Centralize the definition for GHC's libdir on Windows
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        Reporter:  Elieux   |                Owner:  (none)
            Type:  task     |               Status:  new
        Priority:  low      |            Milestone:
       Component:  None     |              Version:  8.0.2
      Resolution:           |             Keywords:
Operating System:  Windows  |         Architecture:  Unknown/Multiple
 Type of failure:  Other    |            Test Case:
      Blocked By:           |             Blocking:
 Related Tickets:           |  Differential Rev(s):
       Wiki Page:           |
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Comment (by Elieux):

 Some of the hard-coded places can be seen here: https://github.com/elieux
 /MINGW-packages/commit/2b70b3985c94fde31d9086c85ffc5297f89f4e47

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13412#comment:1>
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