[MacPorts] #40609: dotwrp: change default gcc variant to gcc48

[MacPorts]

#40609: dotwrp: change default gcc variant to gcc48
--------------------------+-----------------------
 Reporter:  ryandesign@…  |      Owner:  takeshi@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.2.0
 Keywords:                |       Port:  dotwrp
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 Per wiki:PortfileRecipes#gcc please change the default gcc variant to
 gcc48 if possible. Thanks.

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Ticket URL: <https://trac.macports.org/ticket/40609>
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