[MacPorts] #55456: qgis3: don't use eval [subst {...}]

[MacPorts]

#55456: qgis3: don't use eval [subst {...}]
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 Reporter:  ryandesign  |      Owner:  Veence
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  qgis3
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 The `eval [subst {...}]` idiom was removed from all ports in
 [d41a0388cfdf7e6dbf3353d89939eaff876945ec/macports-ports] a couple days
 before qgis3 was committed. Please remove that idiom from qgis3 as well.

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Ticket URL: <https://trac.macports.org/ticket/55456>
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