[MacPorts] #56025: Support ignoring license lmitations in port mirror

[MacPorts]

#56025: Support ignoring license lmitations in port mirror
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  Reporter:  neverpanic   |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Low          |  Milestone:  MacPorts Future
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Description changed by neverpanic:

Old description:

> https://github.com/macports/macports-base/pull/59 added exclusions to
> `port mirror` without a way to ignore these exclusions, which may be
> desirable when running a private mirror.
>
> Document that this exclusion is enabled starting with MacPorts 2.5.0 and
> implement the `--ignore-license` flag in `port mirror`.

New description:

 https://github.com/macports/macports-base/pull/59,
 [fae17c2c7b97f2c6b8d9ab527ef6776b93353a00/macports-base] added exclusions
 to `port mirror` without a way to ignore these exclusions, which may be
 desirable when running a private mirror.

 Document that this exclusion is enabled starting with MacPorts 2.5.0 and
 implement the `--ignore-license` flag in `port mirror`.

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Ticket URL: <https://trac.macports.org/ticket/56025#comment:1>
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