[GHC] #13709: Drop GCC Driver

[GHC]

#13709: Drop GCC Driver
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           Reporter:  Phyx-             |             Owner:  (none)
               Type:  task              |            Status:  new
           Priority:  normal            |         Milestone:  8.4.1
          Component:  Compiler          |           Version:  8.0.1
           Keywords:                    |  Operating System:  Windows
       Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
          Test Case:                    |        Blocked By:
           Blocking:                    |   Related Tickets:
Differential Rev(s):                    |         Wiki Page:
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 The original reason for the Windows GCC driver was to correct hard-coded
 paths in the GCC build from the `msys` project. The `msys2` builds we now
 exclusively use no longer have these issues.

 Which means 90% of the reason for the driver is gone. Given the recent
 issues with the driver. We can/should simplify things and drop it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13709>
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