Support HEVC decoding when using libav
Fix compilation with libav
Merge pull request #138 from qyot27/libav_hevc

libav: compilation fix + HEVC decoding
Fix use of deprecated frame allocation API

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Merge pull request #139 from dwbuiten/elenrilsux

Fix use of deprecated frame allocation API
Relicense VapourSynth.h to MIT with permission from author

Closes #140.
Merge branch 'master' into cplugin_master