[MacPorts] #70958: ffmpeg: add libwebp support

[MacPorts]

#70958: ffmpeg: add libwebp support
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  Reporter:  seamusdemora  |      Owner:  mascguy
      Type:  enhancement   |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.1
Resolution:  fixed         |   Keywords:  haspatch
      Port:  ffmpeg        |
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Comment (by seamusdemora):

 Thanks so much! :)

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Ticket URL: <https://trac.macports.org/ticket/70958#comment:13>
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