[MacPorts] #70958: ffmpeg: add libwebp support

[MacPorts]

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

Comment (by ryandesign):

 Yes, the preceding messages notify you that the fix has been committed. It
 will now take a couple hours before it synchronizes to the public server
 and is available for you to receive by running  `sudo port selfupdate`.

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Ticket URL: <https://trac.macports.org/ticket/70958#comment:12>
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