[MacPorts] #70958: ffmpeg: add libwebp support

[MacPorts]

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

Comment (by ryandesign):

 Also, if you manually compiled webp and installed it  to /usr/local, you
 should remove it and anything else you have installed there because it can
 interfere with MacPorts. See wiki:FAQ#usrlocal.

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Ticket URL: <https://trac.macports.org/ticket/70958#comment:4>
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