Write demux wrapper

[netpyoung]

• api: https://developers.google.com/speed/webp/docs/container-api#demux_api
• build opt : http://www.linuxfromscratch.org/blfs/view/svn/general/libwebp.html

[netpyoung]

11 associated

[netpyoung]

.bundle

• https://github.com/auriamg/macdylibbundler/
• https://stackoverflow.com/questions/1596945/building-osx-app-bundle
• https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html#//apple_ref/doc/uid/10000123i-CH101-SW1

[netpyoung]

https://github.com/netpyoung/unity.webp/pull/17