ffmpeg: binaries no longer distributable, due to rav1e; openssl11 now in play

[mascguy (Christopher Nielsen)]

With the addition of dependency rav1e, ffmpeg +gpl2 is no longer distributable:

$ ../macports-infra/jobs/port_binary_distributable.tcl -v ffmpeg
"ffmpeg" is not distributable because its license "gpl" conflicts with license "OpenSSL" of dependency "openssl11"

Meanwhile rav1e has no lib/runtime deps, and a non-conflicting BSD license:

$ port info rav1e
rav1e @0.5.1_1 (multimedia)

Description:          the fastest and safest AV1 encoder
Homepage:             https://github.com/xiph/rav1e

Build Dependencies:   cargo-c, nasm, rust, cargo
Platforms:            darwin
License:              BSD

Ultimately openssl11 appears to be coming from rust and cargo, which both have lib deps on it. But should that license be propagated to generated binaries...?