[MacPorts] #63936: opensc: fails to build due to openssl3

[MacPorts]

#63936: opensc: fails to build due to openssl3
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  Reporter:  michael-j-oconnor  |      Owner:  lbschenkel
      Type:  defect             |     Status:  closed
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:  fixed              |   Keywords:
      Port:  opensc             |
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Comment (by lbschenkel):

 Added an +openssl3 variant on https://github.com/macports/macports-
 ports/commit/718593d9a5f75d93807fb59130cabdf69a3f1115

 @cjones051073: FYI, setting `openssl.branch` in the Portfile and
 overriding in a variant didn't work for me, it still uses the branch set
 globally, so I had to add a guard to avoid setting it globally when the
 variant also sets it. Is this a bug in the PortGroup? Maybe you want to
 take a look at it. If not a bug, then please let me know the proper way of
 doing it.

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Ticket URL: <https://trac.macports.org/ticket/63936#comment:6>
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