[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:  haspatch
      Port:  ffmpeg        |
---------------------------+----------------------

Comment (by ryandesign):

 In [changeset:"5803b6ed993716736ae2ad82f1e259a3c2a9858c/macports-ports"
 5803b6ed993716736ae2ad82f1e259a3c2a9858c/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="5803b6ed993716736ae2ad82f1e259a3c2a9858c"
 ffmpeg-devel: Enable webp

 See: https://trac.macports.org/ticket/70958
 }}}

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Ticket URL: <https://trac.macports.org/ticket/70958#comment:8>
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