updated for version 7.3.031

Problem:    Can't pass the X window ID to another application.
Solution:   Add v:windowid. (Christian J. Robinson, Lech Lorens)

src/eval.c

@@ -362,6 +362,7 @@ static struct vimvar
     {VV_NAME("operator",	 VAR_STRING), VV_RO},
     {VV_NAME("searchforward",	 VAR_NUMBER), 0},
     {VV_NAME("oldfiles",	 VAR_LIST), 0},
+    {VV_NAME("windowid",	 VAR_NUMBER), VV_RO},
 };
 
 /* shorthand */