Add AvxSynth support to the AviSynth input module.
Uses dlopen to load AvxSynth on Linux and OS X. Allows the use of --demuxer avs for AvxSynth, though the only source filter it can currently use is FFMS2. Add a local copy of avxsynth_c.h and its dependent headers in extras/ so that users don't need to actually have AvxSynth development headers installed to enable support for it (mirroring the AviSynth behavior). Based on a patch by 0x09 (tab@lavabit.com)
extras/avxsynth_c.h
0 → 100644