[MacPorts] #37423: silo: add +gcc47 variant

[MacPorts]

#37423: silo: add +gcc47 variant
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 Reporter:  johnsonsr@…  |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.2
 Keywords:  haspatch     |       Port:  silo
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 Add support for building Silo with the MacPorts gcc 4.7 compiler.

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Ticket URL: <https://trac.macports.org/ticket/37423>
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