[MacPorts] #59198: darwinbuild-legacy: portfile does not set required variables unless on darwin 8 or 9

[MacPorts]

#59198: darwinbuild-legacy: portfile does not set required variables unless on
darwin 8 or 9
------------------------+--------------------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.1
 Keywords:              |       Port:  darwinbuild-legacy
------------------------+--------------------------------
 The darwinbuild-legacy portfile only calls `github.setup` on darwin 8 or
 9, therefore it fails to work properly on other platforms, for example:

 {{{
 $ port distfiles darwinbuild-legacy
 --->  Distfiles for darwinbuild-legacy
 Error: Failed to distfiles darwinbuild-legacy: can't read "master_sites":
 can't read "github.master_sites": can't read "github.homepage": can't read
 "github.author": no such variable
 }}}

 A port using the github portgroup must always call `github.setup`.

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Ticket URL: <https://trac.macports.org/ticket/59198>
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