[MacPorts] #48562: Update qwt to 6.1.2

[MacPorts]

#48562: Update qwt to 6.1.2
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  Reporter:  ghweber@…  |      Owner:  macports-tickets@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.3.3
Resolution:             |   Keywords:  haspatch
      Port:  qwt        |
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Changes (by khindenburg@…):

 * cc: michaelld@… (added)


Comment:

 I've attached my attempt at adding qwt61 - note that this won't build now
 due to recent Qt issues - see ticket 49143

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Ticket URL: <https://trac.macports.org/ticket/48562#comment:4>
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