[MacPorts] #61264: Update gstreamer1 to 1.18.0

Sat Oct 3 02:28:09 UTC 2020

#61264: Update gstreamer1 to 1.18.0
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 Reporter:  Gcenx   |      Owner:  (none)
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
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 gstreamer version 1.18.0 is the new stable, it's moved to using the meson
 build system

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Ticket URL: <https://trac.macports.org/ticket/61264>
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