[MacPorts] #66751: snac @2.18: use the right compiler and flags

[MacPorts]

#66751: snac @2.18: use the right compiler and flags
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  artkiver
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.0
Resolution:              |   Keywords:
      Port:  snac        |
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Changes (by artkiver):

 * Attachment "Portfile.2.19.makefileportgroupandsuch" added.

 Portfile for net/snac which adds the makefile PortGroup, updates the
 version and checksums for 2.19, updates the long_description and tests OK
 locally.

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Ticket URL: <https://trac.macports.org/ticket/66751>
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