[MacPorts] #48562: Update qwt to 6.1.2

[MacPorts]

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

Comment (by khindenburg@…):

 Michael, it looks you've committed most/all of this - can this ticket be
 closed?

-- 
Ticket URL: <https://trac.macports.org/ticket/48562#comment:5>
MacPorts <https://www.macports.org/>
Ports system for OS X