[MacPorts] #70231: iodine: needs net/if_utun.h, which is missing on < 10.6

[MacPorts]

#70231: iodine: needs net/if_utun.h, which is missing on < 10.6
--------------------------+-----------------------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.9.3
 Keywords:                |       Port:  iodine, legacysupport
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 Perhaps add `if_utun.h` from 10.6 into `legacysupport`?
 Or otherwise just pull in required defines in `iodine` and drop the header
 altogether.

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Ticket URL: <https://trac.macports.org/ticket/70231>
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