Fix COERCE-VECTOR-ELEMENT-TYPE for unspecialized vector types.
Fix COERCE-VECTOR-ELEMENT-TYPE for unspecialized vector types.

It was returning * when it should have returned T.
This fixes (make-sequence 'vector ...).

froggey/Mezzano,rvedam/Mezzano,froggey/Mezzano,AugustusHuang/Mezzano,AugustusHuang/Mezzano,rvedam/Mezzano,varjagg/Mezzano,varjagg/Mezzano