[MacPorts] #54683: Qalculate version update to 2.0.0

[MacPorts]

#54683: Qalculate version update to 2.0.0
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  Reporter:  kencu                       |      Owner:  jjstickel
      Type:  update                      |     Status:  assigned
  Priority:  Normal                      |  Milestone:
 Component:  ports                       |    Version:
Resolution:                              |   Keywords:
      Port:  libqalculate qalculate-gtk  |
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Comment (by jjstickel):

 Please review and test the attached patches to the two portfiles for
 libqalculate and qalculate-gtk. It turned out that direct use of
 autoreconf was still OK for qalculate-gtk. I replaced the gnuplot variant
 with a note because nothing changes at the build time whether gnuplot is
 installed or not. BTW, I have never tested gnuplot use with qalculate, so
 I don't know whether it actually works.

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Ticket URL: <https://trac.macports.org/ticket/54683#comment:15>
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