[MacPorts] #40296: ghc @7.6.3_2: Add gcc48 and gcc49 variants, default to gcc48.

[MacPorts]

#40296: ghc @7.6.3_2: Add gcc48 and gcc49 variants, default to gcc48.
-------------------------+--------------------------------
 Reporter:  crossd@…     |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  haspatch     |       Port:  ghc
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 Please find attached a Portfile diff for ghc to add gcc48 and gcc49
 variants and change the default variant gcc48.  I did this to bring ghc in
 line with other ports, which seem to be defaulting to gcc48 and providing
 variants for gcc49.

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Ticket URL: <https://trac.macports.org/ticket/40296>
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