[MacPorts] #48065: Update to gdb 7.9

[MacPorts]

#48065: Update to gdb 7.9
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 Reporter:  guru@…   |      Owner:  macports-tickets@…
     Type:  request  |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.3.3
 Keywords:  gdb      |       Port:  gdb
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 The version of gdb in the port tree is too old.
 Please update it.

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Ticket URL: <https://trac.macports.org/ticket/48065>
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