Fix cuda builds for lower than 6.1 ffmpeg versions #273
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Previously we were always compiling code that contained a macro introduced in a new ffmpeg version. That would fail because that macro was not defined.
This change guards
getFFMPEGContextFromExistingCudaContext
for older libavutil versions because it contains a macro that's introduced in FFMPEG 6 onwards.Also add more builders for different ffmpeg versions