[MacPorts] #56414: mlt: upgrade to v6.6.0

[MacPorts]

#56414: mlt: upgrade to v6.6.0
---------------------------------+--------------------
 Reporter:  ddennedy             |      Owner:  (none)
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:
 Keywords:  maintainer haspatch  |       Port:  mlt
---------------------------------+--------------------
 This version includes support for SDL 2, and the existing patch files in
 the port can be removed. This also addresses #56412 since it addresses
 changes in new version of ffmpeg dependency.

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Ticket URL: <https://trac.macports.org/ticket/56414>
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