nroff tempfile

[utzoo!henry]

For some curious reason, the nroff distributed with V7 has a temporary
file only half the size of that of troff.  This can really make life
difficult when trying to use big macro packages.  It is trivial to
make the nroff tempfile the same size as troff's.  About line 18 in
tdef.h, you will find:

	#define TEMP 256	/*65K*/

Just change 256 to 512 (with the appropriate change to the comment if
you're feeling fussy) and recompile.  Anything bigger than that will
require more work -- you hit a 16-bit limit -- although the machinery
for it seems to be there in the code already.

This change has no repercussions elsewhere and doesn't break anything.
At least, it caused no problems in our nroff, which is pretty much
straight off the distribution tape.