[MacPorts] #70536: QMPlay2: avoid opportunistic linking to libsidplayfp

[MacPorts]

#70536: QMPlay2: avoid opportunistic linking to libsidplayfp
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 Reporter:  barracuda156  |      Owner:  barracuda156
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.10.0
 Keywords:                |       Port:  QMPlay2
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 At least Qt4 subport needs `-DUSE_CHIPTUNE_SID=OFF` to avoid opportunistic
 linking to `libsidplayfp` (or otherwise turn it on and declare explicit
 dependency).

 I will do it together with some update, no urgency here.

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Ticket URL: <https://trac.macports.org/ticket/70536>
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