This is a local copy of the Xiph libs used by Theorafile, with all the unused
files stripped out. Below are the notes for each library.

libogg: Version 1.3.3
	- os_types.h falls back to stdint for unrecognized platforms
libvorbis: Version 1.3.6
	- info.c has been renamed to vinfo.c
libtheora: git commit 7180717276af1ebc7da15c83162d6c5d6203aabf
	- info.c has been renamed to tinfo.c
	- AArch64 NEON support from https://github.com/linnaea/theora