[Groff] pdfmark patch

[Zvezdan Petkovic]

I had to apply the attached patch to build groff-1.19.2.pre-20050527 on
OpenBSD 3.7.  Keith uses $(RM) without ever defining it.  I checked
through the whole groff source tree and it's not defined anywhere.
Thus those lines were failing trying essentially to execute the argument
to $(RM).  This solved the problem.  You may want to think about the
better solution.

        ZP

P.S. I used BSD native make as always.

patch-Makefile_sub
Description: Text document