After some time away from this hogwash of builtin and modified libraries in nvtt im back to work on it. Right now I think I have to rewrite the use of libsquish in the project before i can link it with the system library, as it uses internal and deprecated header files to do colourspace compressions in DXT1 and 3.
I'll try to get this in though and replace one more bundled library in exchange for three new ones added in 2.1.0 ...
