[MacPorts] #29185: py-pyodbc: Add iODBC variant

[MacPorts]

#29185: py-pyodbc: Add iODBC variant
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  Reporter:  stevemcc@…   |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  py-pyodbc    |
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Comment (by khindenburg@…):

 I tried to update this and include your variants but I can't really test
 the actual code

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Ticket URL: <https://trac.macports.org/ticket/29185#comment:4>
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