The Windows CI/CD archive (BtbN) is a shared build whose seven MSVC
import libraries have canonical names and whose .pc files carry no
external Libs.private, so pkg-config resolution is unnecessary there.
When neither pkg-config nor pkgconf exists, the script now emits the
fixed link line instead of panicking — but only on Windows: everywhere
else a static FFmpeg still needs the transitive list from its .pc files,
and MSYS2 local builds keep using pkg-config.
The FFmpeg 9 note in oak-codec's manifest is refreshed as well.
Mike-Solar
725a1d4da0