bug#12109: 23.4; woman.el recognise ".if v"

[Kevin Ryde]

Processing the file ifv.1 below with

    (woman-find-file "ifv.1")

puts a warning in *WoMan-Log*

    **  if v -- unrecognized condition name rejected!

where I thought it might quietly treat ".if v" as false.

According to the groff manual "v" is "-Tversatec" output, whatever or
wherever that is.  Perl pod2man generates it for some accenting with a
comment that it's "for vroff".  Perhaps woman could treat it as false
the same as groff

2012-07-31  Kevin Ryde  <user42@zip.com.au>

        * woman.el (woman0-if): Recognise ".if v" per groff, default false.

.TH FOO 1
.SH NAME
.if v .B something

--- woman-24.el 2012-07-09 12:07:42.000000000 +1000
+++ woman.el    2012-07-31 10:17:22.000000000 +1000
@@ -2550,7 +2550,8 @@
     (cond
      ;; ((looking-at "[no]") (setq c t))     ; accept n(roff) and o(dd page)
      ;; ((looking-at "[te]") (setq c nil))   ; reject t(roff) and e(ven page)
-     ((looking-at "[ntoe]")
+     ;; Per groff ".if v" is recognised but false (it means -Tversatec).
+     ((looking-at "[ntoev]")
       (setq c (memq (following-char) woman-if-conditions-true)))
      ;; Unrecognized letter so reject:
      ((looking-at "[A-Za-z]") (setq c nil)


In GNU Emacs 23.4.1 (i486-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2012-04-08 on biber, modified by Debian
configured using `configure  '--build' 'i486-linux-gnu' '--build' 
'i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.4/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.4/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/i386-linux-gnu' '--with-x=yes' '--with-x-toolkit=gtk' 
'--with-toolkit-scroll-bars' 'build_alias=i486-linux-gnu' 'CFLAGS=-g -O2 
-fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security 
-Werror=format-security -Wall -DDEBIAN -O2' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_AU
  value of $XMODIFIERS: nil
  locale-coding-system: iso-latin-1-unix
  default enable-multibyte-characters: t