[GHC] #12720: Remoce ghcii.sh

[GHC]

#12720: Remoce ghcii.sh
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           Reporter:  Phyx-           |             Owner:
               Type:  task            |            Status:  new
           Priority:  normal          |         Milestone:
          Component:  Compiler        |           Version:  8.0.1
           Keywords:                  |  Operating System:  Windows
       Architecture:  x86_64 (amd64)  |   Type of failure:  Other
          Test Case:                  |        Blocked By:
           Blocking:                  |   Related Tickets:
Differential Rev(s):                  |         Wiki Page:
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 On Windows we have an extra script `ghcii.sh` that is recommended when we
 run in a console that does not use `conhost`. e.g mintty from msys2 or the
 cygwin shell.

 This is because the sigINT signal is being swallowed by these consoles.

 I believe we can work around this by listening to Window messages as well.
 These consoles do their own drawings, which means they load `gdi32.dll`.

 Which means they have a message pump so should be receiving Window events.
 See https://msdn.microsoft.com/en-
 us/library/windows/desktop/ms686016(v=vs.85).aspx

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12720>
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