build-support/factor.cmd: cleanups recommended by mnestic
build-support/factor.cmd: cleanups recommended by mnestic

cataska/factor,kingcons/factor,mcandre/factor,erg/factor,mcandre/factor,kingcons/factor,erg/factor,ceninan/factor,kingcons/factor,cataska/factor,erg/factor,cataska/factor,cataska/factor,mcandre/factor,mcandre/factor,kingcons/factor,ceninan/factor,erg/factor,mcandre/factor,ceninan/factor,erg/factor,mcandre/factor,erg/factor,erg/factor,mcandre/factor,ceninan/factor