Yes, CAS will still be built, but without image stats support (cas -o will work just as cas without arguments). BUT, libgd has nothing to do with GUI ;-) building with libgd will activate the -o switch, but CAS will still have no GUI (CAS is just a command line app).
Another note: noamulegui seems quite confusive IMHO. If I wasn't aware about what it does, I would think switching noamulegui would actually disable aMule's Graphical Interface (not only the utils's GUI).
The Polish: That's exactly what I meant, although most probably I didn't explain myself, xDDD
Greetings