[MacPorts] #48468: wxMaxima: update to 15.04.0

[MacPorts]

#48468: wxMaxima: update to 15.04.0
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 Reporter:  ionic@…   |      Owner:  mk@…
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  haspatch  |       Port:  wxMaxima
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 `wxMaxima` hasn't been updated in a while. The current version is 15.04.0.

 Patch attached.

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Ticket URL: <https://trac.macports.org/ticket/48468>
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