Avoid calling chn_wrfeed with an empty soft buffer
groff: Commit our local patches.
groff(1): disable hyphenation and change bullet representation

In order to switch to mandoc(1) eventually we want groff(1) to
output manual pages as similar as possible.  Hyphenation is the
biggest offender.

Approved-by: swildner
Taken-from:  OpenBSD
fix mandoc(1) warnings in sbin/

dump.8 bits taken from FreeBSD.