Mark boolean constants as such.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5537 d4fa192b-c00b-0410-8231-f00ffab90ce4

lib/libvcl/vcc_expr.c

@@ -442,8 +442,9 @@ static void
 vcc_Eval_BoolConst(struct vcc *tl, struct expr **e, const struct symbol *sym)
 {
 
-	*e = vcc_mk_expr(BOOL, "(0==%d)", sym->eval_priv == NULL ? 1 : 0);
 	vcc_NextToken(tl);
+	*e = vcc_mk_expr(BOOL, "(0==%d)", sym->eval_priv == NULL ? 1 : 0);
+	(*e)->constant = 1;
 }
 
 /*--------------------------------------------------------------------