[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
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  Reporter:  barracuda156           |      Owner:  (none)
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.9.3
Resolution:                         |   Keywords:
      Port:  iodine, legacysupport  |
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Description changed by barracuda156:

Old description:

> Perhaps add `if_utun.h` from 10.6 into `legacysupport`?
> Or otherwise just pull in required defines in `iodine` and drop the
> header altogether.

New description:

 Perhaps add `if_utun.h` from 10.6 into `legacysupport`?
 Or otherwise just pull in required defines in `iodine` and drop the header
 altogether.

 Issue with upstream: https://github.com/yarrick/iodine/issues/98

 P. S. We also need to remove `-Wtype-limits` for Xcode gcc.

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Ticket URL: <https://trac.macports.org/ticket/70231#comment:1>
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