[MacPorts] #61237: Use SPDX license identifiers

[MacPorts]

#61237: Use SPDX license identifiers
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 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:
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 MacPorts has its own guidelines for how to specify port license names. We
 should probably move toward using the same license identifiers popularized
 by SPDX: https://spdx.org/licenses/

 The license names we use have to be understood by our
 port_binary_distributable.tcl script. There may need to be a transitional
 period during which the script is updated to recognize both our old
 license names and new SPDX license identifiers. Later, once all ports have
 been updated to use SPDX, we can remove our old license names.

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Ticket URL: <https://trac.macports.org/ticket/61237>
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