[MacPorts] #46700: ffmpeg: add openssl variant

[MacPorts]

#46700: ffmpeg: add openssl variant
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  Reporter:  eirnym@…     |      Owner:  devans@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ffmpeg       |
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Comment (by eirnym@…):

 The rtmpdump depends on OpenSSL with GPL-2+ licence, so linking with
 OpenSSL doesn't add any restrictions for ffmpeg itself.

 I know people who want licence purity on their systems and they don't want
 OS on their computers like Mac OS X or *BSD.

 I don't want to build anything which duplicates functionality if it
 possible: I don't like GnuTLS when it possible to replace it with OpenSSL,
 I don't like build SVN client if I we don't need to link with SVN
 libraries, etc.

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Ticket URL: <https://trac.macports.org/ticket/46700#comment:5>
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