#16407: Non-versioned haddock.exe is not part of the Windows bindist tarball

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#16407: Non-versioned haddock.exe is not part of the Windows bindist tarball
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           Reporter:  cocreature        |             Owner:  (none)
               Type:  bug               |            Status:  new
           Priority:  high              |         Milestone:
          Component:  Compiler          |           Version:  8.6.4
           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 GHC 8.6.3 Windows bindist tarball contained both
 `ghc-8.6.3/bin/haddock-8.6.3.exe` as well as `ghc-8.6.4/bin/haddock.exe`.
 However, the 8.6.4 tarball only contains the executable with a version
 suffix `ghc-8.6.4/bin/haddock-8.6.4.exe`. This broke some users, e.g., the
 Shake CI
 https://ci.appveyor.com/project/ndmitchell/shake/builds/22909548#L971 but
 also `rules_haskell` which assume the existence of that executable.

 Assuming this change was not intentional, it would be great if we could
 get a bindist that contains the unversioned haddock.exe.

 Not sure if this is related to #16398.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16407>