drop mandatory keyword for better compatibility
drop mandatory keyword for better compatibility

fplll/fplll,fplll/fplll,GottfriedHerold/fplll,cr-marcstevens/fplll,shi-bai/fplll,blowfish880/fplll,pfasante/fplll,shi-bai/fplll,malb/fplll,cr-marcstevens/fplll,gbonnoron/fplll,shi-bai/fplll,fplll/fplll,dstehle/fplll,fplll/fplll,cr-marcstevens/fplll,dstehle/fplll,blowfish880/fplll,dstehle/fplll,GottfriedHerold/fplll,malb/fplll,GottfriedHerold/fplll,gbonnoron/fplll,shi-bai/fplll,malb/fplll,fplll/fplll,blowfish880/fplll,cr-marcstevens/fplll,pfasante/fplll,pfasante/fplll,gbonnoron/fplll