tests: improve neomake#utils#load_ft_makers to skip already loaded files (#1649)
tests: improve neomake#utils#load_ft_makers to skip already loaded files (#1649)


neomake/neomake,nerdrew/neomake,euclio/neomake,euclio/neomake,neomake/neomake,nerdrew/neomake,codeinabox/neomake