tex: add pdflatex maker
tex: add pdflatex maker

Closes https://github.com/neomake/neomake/pull/1236.

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