[MacPorts] #35569: libarchive: update to 2.8.5, github portgroup, liblzma -> xz

[MacPorts]

#35569: libarchive: update to 2.8.5, github portgroup, liblzma -> xz
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  toby@…           
     Type:  update                   |      Status:  new              
 Priority:  Normal                   |   Milestone:                   
Component:  ports                    |     Version:  2.1.2            
 Keywords:  haspatch                 |        Port:  libarchive       
-------------------------------------+--------------------------------------
 libarchive is now hosted at github. This patch makes the port use the
 github portgroup, updates it to version 2.8.5, and changes the lzma
 variant's dependency from liblzma to xz (looks like we forgot to do this
 in libarchive when we did it in other ports in r94904).

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Ticket URL: <https://trac.macports.org/ticket/35569>
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