[MacPorts] #56334: ffmpeg @3.4.2: update to 4.0

[MacPorts]

#56334: ffmpeg @3.4.2: update to 4.0
---------------------+----------------------
  Reporter:  l2dy    |      Owner:  dbevans
      Type:  update  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  security
      Port:  ffmpeg  |
---------------------+----------------------
Changes (by l2dy):

 * keywords:   => security


Comment:

 https://ffmpeg.org/security.html
 {{{
 CVE-2018-6912, 76cc0f0f673353cd4746cd3b83838ae335e5d9ed
 CVE-2018-7751, a6cba062051f345e8ebfdff34aba071ed73d923f
 CVE-2018-7557, 7414d0bda7763f9bd69c26c068e482ab297c1c96
 }}}

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Ticket URL: <https://trac.macports.org/ticket/56334#comment:1>
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