[bug #61407] Remove spurious error messages generated by pdf.tmac

[Dave]

Follow-up Comment #9, bug #61407 (project groff):

Commit 557bc055
<http://git.savannah.gnu.org/cgit/groff.git/commit/?id=557bc055> applies a
temporary Band-aid to the problem by hiding the warnings unless an
(undocumented) environment variable is set.

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