[GHC] #11354: Install script installs docs without -version suffix

[GHC]

#11354: Install script installs docs without -version suffix
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           Reporter:  osa1           |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Build System   |           Version:  8.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 This is potentially bad when multiple GHC versions are installed - last
 installed one overwrites all the docs.

 It seems like docs are installed under {{{$PACKAGE_TARNAME}}}, and tarname
 is initialized as {{{"ghc"}}} in the {{{ac}}} file. I guess one solution
 would be to add version suffix to tarname (it seems like tarname is only
 used when installing docs) or alternatively use
 {{{${PACKAGE_TARNAME}-${PACKAGE_VERSION}}}} to install docs.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11354>
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