[MacPorts] #45840: gcc49: update to 4.9.2

[MacPorts]

#45840: gcc49: update to 4.9.2
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  Reporter:  ryandesign@…  |      Owner:  mww@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  haspatch
      Port:  gcc49         |
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Comment (by larryv@…):

 Replying to [comment:2 ryandesign@…]:
 > `Fix-__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__.patch` can be
 > deleted as it seems no longer to be needed.

 Upstream actually [https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61407#c42
 committed an incorrect fix]; our current patch is incorrect also. I’ve
 just prepared a correct fix, which I will submit upstream as soon as I run
 some tests.

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Ticket URL: <https://trac.macports.org/ticket/45840#comment:3>
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