[MacPorts] #71523: wget: make metalink support a variant

[MacPorts]

#71523: wget: make metalink support a variant
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  Reporter:  lcvisser          |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:
      Port:  wget libmetalink  |
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Changes (by lcvisser):

 * Attachment "wget-Portfile.diff" added.

 I've prototyped the variant, see attached diff. I'll create a proper PR
 tonight or tomorrow.

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Ticket URL: <https://trac.macports.org/ticket/71523>
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