[MacPorts] #70958: ffmpeg: add libwebp support

[MacPorts]

#70958: ffmpeg: add libwebp support
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  Reporter:  seamusdemora  |      Owner:  mascguy
      Type:  enhancement   |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.1
Resolution:                |   Keywords:
      Port:  ffmpeg        |
---------------------------+----------------------

Comment (by seamusdemora):

 Ryan,

 I should have mentioned that I also installed `webp` using MacPorts... but
 that didn't prevent the error with `ffmpeg`.

 ~S

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Ticket URL: <https://trac.macports.org/ticket/70958#comment:2>
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