mdocml: Support the ".if v" conditional operator (vroff mode, always

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Support the ".if v" conditional operator (vroff mode, always false)
for groff compatibility because pod2man(1) uses it that way.
Weirdly, groff documents it as "for compatibility with other 
troff versions" but neither Heirloom nor Plan 9 have it.
Issue reported by giovanni@ via sthen@.

Modified Files:
--------------
    mdocml:
        roff.7
        roff.c

Revision Data
-------------
Index: roff.7
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/roff.7,v
retrieving revision 1.58
retrieving revision 1.59
diff -Lroff.7 -Lroff.7 -u -p -r1.58 -r1.59
--- roff.7
+++ roff.7
@@ -747,9 +747,11 @@ If the first character of COND is
 .Pq even page ,
 .Sq r
 .Pq register accessed ,
-or
 .Sq t
 .Pq troff mode ,
+or
+.Sq v
+.Pq vroff mode ,
 COND evaluates to false.
 .It
 If COND starts with a parenthesis or with an optionally signed
Index: roff.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/roff.c,v
retrieving revision 1.238
retrieving revision 1.239
diff -Lroff.c -Lroff.c -u -p -r1.238 -r1.239
--- roff.c
+++ roff.c
@@ -1272,6 +1272,8 @@ roff_evalcond(struct roff *r, int ln, co
 	case 'r':
 		/* FALLTHROUGH */
 	case 't':
+		/* FALLTHROUGH */
+	case 'v':
 		(*pos)++;
 		return(!wanttrue);
 	default:
--
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