[MacPorts] #59018: ghc missing html and pdf user guides

[MacPorts]

#59018: ghc missing html and pdf user guides
-----------------------+--------------------
 Reporter:  essandess  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.5.4
 Keywords:             |       Port:  ghc
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 The latest ghc is missing the GHC User's Guide in the files
 {{{/opt/local/share/doc/ghc-8.6.5/html/users_guide/}}} and
 {{{/opt/local/share/doc/ghc-8.6.5/users_guide.pdf}}}.

 I know first-hand that these are created and installed when building from
 source.

 But I don't know what changed with the buildbot version during the merge
 of https://github.com/macports/macports-ports/pull/5049 that causes this
 issue.

 We should modify the Portfile so that the GHC User's Guide, both HTML and
 pdf versions, are created and installed by the buildbot.

 Also, I'm listed as the maintainer, but don't know how to address this
 buildbot issue, so please assign appropriately.

-- 
Ticket URL: <https://trac.macports.org/ticket/59018>
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