This e-build previously downloaded a tarball from my mirror, which
included the modified libraries. It was pretty janky, so I implemented
it the way that the other overlays have by downloading libnbtplusplus
and quazip separately, then copying it in using src_unpack(). Thanks to
whoever figured that out!
After carefully analysis, RepoMan has declared my formerly sacrilegious
overlay to be to be decent. The ebuilds still need some fixing, but this
is certainly a step in the right direction.