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

[MacPorts]

#37423: silo: add +gcc47 variant
--------------------------+--------------------------------
  Reporter:  johnsonsr@…  |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:  fixed        |   Keywords:  haspatch
      Port:  silo         |
--------------------------+--------------------------------
Changes (by macsforever2000@…):

 * status:  new => closed
 * version:  2.1.2 =>
 * resolution:   => fixed


Comment:

 r100909

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Ticket URL: <https://trac.macports.org/ticket/37423#comment:6>
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