[MacPorts] #25558: ghc: update to latest version

[MacPorts]

#25558: ghc: update to latest version
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 Reporter:  jwiegley@…          |       Owner:  gwright@…           
     Type:  update              |      Status:  assigned            
 Priority:  Normal              |   Milestone:                      
Component:  ports               |     Version:                      
 Keywords:                      |        Port:  ghc ghc-devel       
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Comment(by cal@…):

 I've attached a patch that will disable building PDF documentation with
 dblatex even if it's installed. Since the patch changes `configure` and
 not `configure.in` we don't need to add a dependency on autotools.

 However, a build-dependency on libxslt is needed, because it is being used
 to generate HTML documentation.

 I've added the patch and dependency and fixed some minor issues (trailing
 whitespace, unneeded use of tags in distfiles) and attached another
 version of the Portfile.

 My wording on "miscompiles ghc" could probably have been better. I didn't
 want to say "ghc compiles but doesn't work correctly", but "ghc doesn't
 compile at all". I haven't found out why this is happening, and even more
 strange, it seems to work for you. I'll attach my main.log, maybe you have
 an idea why it fails?

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Ticket URL: <https://trac.macports.org/ticket/25558#comment:42>
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