cmake: clean up gmx-4 stuff in defaults
cmake: clean up gmx-4 stuff in defaults

junghans/csg,votca/csg,MrTheodor/csg,MrTheodor/csg,MrTheodor/csg,junghans/csg,junghans/csg,junghans/csg,junghans/csg,votca/csg,votca/csg,MrTheodor/csg,votca/csg,MrTheodor/csg,junghans/csg