[MacPorts] #45840: gcc49: update to 4.9.2

[MacPorts]

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

 * keywords:   => haspatch


Comment:

 Portfile diff attached. `Fix-
 __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__.patch` can be deleted as it
 seems no longer to be needed. `yosemite-symbol-lookup.patch` is updated to
 use `-p0` like the other gcc ports do.

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Ticket URL: <https://trac.macports.org/ticket/45840#comment:2>
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