Adds definition for the libvc library (.Lb macro) and avoids nroff warnings

 -- Rafael Laboissiere <rafael@debian.org>  Tue, 01 Jul 2008 17:10:33 +0200

Index: libvc-003.dfsg.1/doc/vc.3
===================================================================
--- libvc-003.dfsg.1.orig/doc/vc.3	2008-07-01 17:20:46.000000000 +0200
+++ libvc-003.dfsg.1/doc/vc.3	2008-07-01 17:20:54.000000000 +0200
@@ -44,6 +44,7 @@
 .Nm get_val_struct_part
 .Nd vCard library
 .Sh LIBRARY
+.ds str-Lb-libvc         vCard\~library (libvc, \-lvc)
 .Lb libvc
 .Sh SYNOPSIS
 .In vc.h