[MacPorts] #53854: update gdb port version

[MacPorts]

#53854: update gdb port version
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  Reporter:  mabraham  |      Owner:  stuartwesterman
      Type:  update    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gdb       |
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Changes (by mabraham):

 * Attachment "0001-Update-gdb-to-7.12.1.patch" added.

 patch file to use gdb 7.12.1

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Ticket URL: <https://trac.macports.org/ticket/53854>
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