[MacPorts] #69653: mkvtoolnix-legacy: support Qt4 where Qt5 unavailable

[MacPorts]

#69653: mkvtoolnix-legacy: support Qt4 where Qt5 unavailable
-----------------------------------------+-------------------------------
 Reporter:  barracuda156                 |      Owner:  (none)
     Type:  defect                       |     Status:  new
 Priority:  Normal                       |  Milestone:
Component:  ports                        |    Version:  2.9.2
 Keywords:  snowleopard, leopard, tiger  |       Port:  mkvtoolnix-legacy
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 I would expect a `-legacy` port to support legacy systems, but this one
 requires Qt5, which is broken on those.
 It also [https://github.com/macports/macports-
 ports/blob/d2f9f6bb49a41d643b1c975e2bcfd6805e0ca2d5/multimedia/mkvtoolnix-
 legacy/Portfile#L51 wants] Qt5 5.9 minimum, while 10.6.8 on Intel has 5.3.

 Could we please support Qt4 too?

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Ticket URL: <https://trac.macports.org/ticket/69653>
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