Represent bullets (for example in .Bl -bullet) by "o\bo" instead of "+\bo"

to agree with mandoc(1) and reduce noise in automatic output comparisons.
ok ajacoutot@

textproc/groff/Makefile

@@ -1,8 +1,8 @@
-# $OpenBSD: Makefile,v 1.12 2011/06/23 12:14:51 schwarze Exp $
+# $OpenBSD: Makefile,v 1.13 2011/07/07 05:27:15 schwarze Exp $
 
 COMMENT =		GNU troff typesetter
 DISTNAME =		groff-1.21
-REVISION =		3
+REVISION =		4
 
 CATEGORIES =		textproc
 HOMEPAGE =		http://www.gnu.org/software/groff/

textproc/groff/patches/patch-tmac_tty_tmac

@@ -0,0 +1,15 @@
+# Make this behave exactly the same way as mandoc(1).
+# This makes my life easier for comparisions, and users won't notice.
+# Changing mandoc output to "+\bo" would kill -Tps, so that's out.
+$OpenBSD: patch-tmac_tty_tmac,v 1.1 2011/07/07 05:27:15 schwarze Exp $
+--- tmac/tty.tmac.orig	Fri Dec 31 00:33:09 2010
++++ tmac/tty.tmac	Wed Jul  6 19:19:12 2011
+@@ -17,7 +17,7 @@
+ .  if c\[md] \
+ .    tr \[bu]\[md]
+ .
+-.fchar \[bu] \z+o
++.fchar \[bu] o
+ .fchar \[14] 1/4
+ .fchar \[12] 1/2
+ .fchar \[34] 3/4