[MacPorts] #38780: xraylib: use github portgroup

[MacPorts]

#38780: xraylib: use github portgroup
--------------------------+------------------------------
 Reporter:  ryandesign@…  |      Owner:  Tom.Schoonjans@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.1.3
 Keywords:  haspatch      |       Port:  xraylib
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 This patch changes the xraylib port to use the github portgroup. This
 makes the livecheck work.

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Ticket URL: <https://trac.macports.org/ticket/38780>
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