[MacPorts] #68544: gcc10-bootstrap forces unversal builds on Leopard, not respecting even explicit -universal

[MacPorts]

#68544: gcc10-bootstrap forces unversal builds on Leopard, not respecting even
explicit -universal
------------------------------+------------------------------
  Reporter:  barracuda156     |      Owner:  catap
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.8.1
Resolution:                   |   Keywords:  leopard, powerpc
      Port:  gcc10-bootstrap  |
------------------------------+------------------------------

Comment (by barracuda156):

 Initially I tried without extra steps, just unsetting universal variant
 from defaults, then added extra measures sequentially, in any case I got
 the same outcome of forced universal build.

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Ticket URL: <https://trac.macports.org/ticket/68544#comment:1>
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