[MacPorts] #43731: ola: use "github.tarball_from releases"

[MacPorts]

#43731: ola: use "github.tarball_from releases"
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 Reporter:  ryandesign@…  |      Owner:  nomis52@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.2.99
 Keywords:  haspatch      |       Port:  ola
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 This patch makes ola use "github.tarball_from releases" (which was just
 added to the github portgroup) instead of manually specifying the
 master_sites.

 If you have no objection, I'd be happy to commit it.

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Ticket URL: <https://trac.macports.org/ticket/43731>
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