avcodec/libavcodec.v: Tighten export whitelist
Currently every symbol (with external linkage) that starts with "av" is exported. Yet libaom-av1 has lots of functions that are not meant to be exported and start with "av1_" (I counted 1236); and libvpx has average_split_mvs. These functions are exported if one links these libraries statically into a shared libavcodec.so. Solve this by tightening the whitelist to "av_", "avcodec_", "avpriv_" and (as a special-case) "avsubtitle_free". Reviewed-by:Michael Niedermayer <michael@niedermayer.cc> Signed-off-by:
Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
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