Add --without-x to the configure help text

[Steven Edwards]

Configure for Wine already supports --without-x however it doesn't show up
in the list when running ./configure --help
Add it here for documentation purposes.

Changelog:
   Add --without-x to the configure help

-- 
Steven Edwards

"There is one thing stronger than all the armies in the world, and that is
an idea whose time has come." - Victor Hugo
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diff --git a/configure.ac b/configure.ac
index b592615..967e660 100644
--- a/configure.ac
+++ b/configure.ac
@@ -75,6 +75,7 @@ AC_ARG_WITH(pthread,   AS_HELP_STRING([--without-pthread],[do not use the pthrea
 AC_ARG_WITH(sane,      AS_HELP_STRING([--without-sane],[do not use SANE (scanner support)]))
 AC_ARG_WITH(tiff,      AS_HELP_STRING([--without-tiff],[do not use TIFF]))
 AC_ARG_WITH(v4l,       AS_HELP_STRING([--without-v4l],[do not use v4l1 (v4l support)]))
+AC_ARG_WITH(x,         AS_HELP_STRING([--without-x],[do not use the X Window System (X11 support)]))
 AC_ARG_WITH(xcomposite,AS_HELP_STRING([--without-xcomposite],[do not use the Xcomposite extension]),
             [if test "x$withval" = "xno"; then ac_cv_header_X11_extensions_Xcomposite_h=no; fi])
 AC_ARG_WITH(xcursor,   AS_HELP_STRING([--without-xcursor],[do not use the Xcursor extension]),