Eliminated a temporary, artificial usage of some data members.
Couple of more fixes that were needed last week.
The stage is set for adding a decompress function.
Start trying to add Mesa source to leverage.

I originally copied over the Mesa3D "src/mesa/main/texcompress*" files.  In
trying to compile the files, I ended up copying over more header files.  It's
still not compiling.
Tried to get the ETC code to compile by commenting things out.

Still not working.