[Groff] Tiny make patch: avoid Netpbm dependency

[Steffen Nurpmeso]

Hello,
for me the dependency upon Netpbm is "annoying"; i always restart
failed makes to get over all related problems: like that
(single-threaded) compilation is just fine.

Configuration checks for (some) Netpbm programs and avoids
$make_html as necessary -- however, xpmtoppm(1), pnmdepth(1) and
pnmtops(1) are still required to generate `gnu.eps', which in turn
is used by some examples only; etc.

Given this and the fact that `groff-1.22.2.tar.gz' is 3.8M i think
it would be great if `gnu.eps' could be part of the repo / the
release balls: compressed with gzip(1) it is 15KB (xz(1): 10KB).
I'll attach a diff (missing `gnu.eps') that would do so.

(Still ugly: www. is installed even without Netpbm, pnmtops(1)
maybe checked twice even if $make_html is false *because* it is
pnmtops(1) that is missing... etc.  I.e., configure(1) could check
for convert(1) from ImageMagick as a fallback?)

--steffen

groff-netpbm.diff
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