[GHC] #10705: make configure warn when ghc-tarballs is missing on windows and provide guidance to download it.

[GHC]

#10705: make configure warn when ghc-tarballs is missing on windows and provide
guidance to download it.
-------------------------------------+-------------------------------------
        Reporter:  Phyx-             |                   Owner:
            Type:  task              |                  Status:  closed
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Build System      |                 Version:  7.11
      Resolution:  fixed             |                Keywords:
Operating System:  Windows           |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #9218             |  Differential Revisions:  Phab:D1108
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Comment (by Phyx-):

 Well, for 7.8.x there is
 https://ghc.haskell.org/trac/ghc/wiki/Building/GettingTheSources/Legacy

 Would an idea be to extend this page to include 7.10 and link to it from
 the build instructions?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10705#comment:12>
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