- Update to version 0.8.7:
* implement DefineScalingGrid tag
* switch to 32bit float audio sampling for standalone player and
remove SDL2_mixer dependency
* improved support for AVM1 swf files
* implement "erase" blendmode
* use nanoVG for bitmaps in fillstyles
* improved support for morphshapes
* improved support for adpcm encoded sounds
* add garbage collection mechanism for less memory usage
* better overall compatibility for many swf files
* several performance improvements
- Drop pkgconfig(SDL2_mixer) BuildRequires: No longer needed.