[MacPorts] #65094: ffmpeg: add support for libssh

[MacPorts]

#65094: ffmpeg: add support for libssh
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  Reporter:  sectroyer            |      Owner:  mascguy
      Type:  enhancement          |     Status:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.7.2
Resolution:                       |   Keywords:
      Port:  ffmpeg ffmpeg-devel  |
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Comment (by sectroyer):

 I tried modifying original Portfile and I think it worked. I attach file
 that compiled working ffmpeg with libssh for me. Please let me know if it
 needs any changes.

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Ticket URL: <https://trac.macports.org/ticket/65094#comment:4>
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