MINOR: http: Add 410 to http-request deny

This patch adds http status code 410 Gone to http-request deny. See
issue #80.

(cherry picked from commit 272e29b5cc55baacce96350a5921a5ae204f43d3)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit d97b1b62743da4b6a85e59d176c9e7791f83c69a)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/include/common/http.h b/include/common/http.h
index b0befa5..eb12f25 100644
--- a/include/common/http.h
+++ b/include/common/http.h
@@ -85,6 +85,7 @@
 	HTTP_ERR_403,
 	HTTP_ERR_405,
 	HTTP_ERR_408,
+	HTTP_ERR_410,
 	HTTP_ERR_421,
 	HTTP_ERR_425,
 	HTTP_ERR_429,