Potential Antimalarials. XX. Mannich Base Derivatives of 2-[7-Chloroquinolin-4-ylamino and 7-Bromo(and 7-trifluoromethyl)-1,5-naphthyridin-4-ylamino]-4-chloro(or 4- or 6-t-Butyl or 4- or 5-fluoro)phenols and 4(or 6)-t-Butyl-2-(7-trifluoromethylquinolin-4-ylamino)phenol