[travis] improve messages for "overfull \hbox" and "Reference ... und… #3273
+4
−2
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…efined"
New output, including a nice filename prefix:
$ ../tools/check.sh
utilities.tex:LaTeX Warning: Reference `blah' on page 733 undefined on input line 21555.
utilities.tex:Overfull \hbox (26.88779pt too wide) in paragraph at lines 21560--21561