[MacPorts] #42545: xraylib: update to version 3.0.0

[MacPorts]

#42545: xraylib: update to version 3.0.0
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  Reporter:  Tom.Schoonjans@…  |      Owner:  macports-tickets@…
      Type:  update            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.2.1
Resolution:                    |   Keywords:
      Port:  xraylib           |
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Comment (by macsforever2000@…):

 [https://guide.macports.org/#development.patches Per the guidelines],
 please instead attach a unified diff of the Portfile.

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Ticket URL: <https://trac.macports.org/ticket/42545#comment:1>
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