[MacPorts] #40471: update ccpnmr to 2.3.1r2, add gcc48/gcc49 variants and default to gcc48 variant

[MacPorts]

#40471: update ccpnmr to 2.3.1r2, add gcc48/gcc49 variants and default to gcc48
variant
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 Reporter:  howarth@…  |      Owner:  macports-tickets@…
     Type:  update     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.2.0
 Keywords:             |       Port:  ccpnmr
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 The attached Portfile.diff updates the ccpnmr package to the latest
 2.3.1rc2 release and also adds gcc48/gcc49 variants as well as switching
 the default variant from gcc47 to gcc48.

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Ticket URL: <https://trac.macports.org/ticket/40471>
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