tex: chktex: look for .chktexrc config files
tex: chktex: look for .chktexrc config files

Closes https://github.com/neomake/neomake/pull/1456.

Reported-By: Michael Mior <7e620dda0467f86141febe41de6452ffa674dcd3@uwaterloo.ca>

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