[MacPorts] #46700: ffmpeg: add openssl variant

[MacPorts]

#46700: ffmpeg: add openssl variant
-------------------------+--------------------------------
 Reporter:  eirnym@…     |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  ffmpeg
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 ffmpeg can be linked with GnuTLS and OpenSSL libraries. this path add this
 variant.

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