[MacPorts] #49227: fix gcj in gcc5

[MacPorts]

#49227: fix gcj in gcc5
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  Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.4
Resolution:                         |   Keywords:
      Port:  gcc5                   |
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Comment (by jeremyhu@…):

 We should also blacklist gcc49 and earlier on El Cap while we're at it.

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Ticket URL: <https://trac.macports.org/ticket/49227#comment:2>
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