[MEDIUM] server: add support for the "send-proxy" option

This option enables use of the PROXY protocol with the server, which
allows haproxy to transport original client's address across multiple
architecture layers.
diff --git a/include/types/server.h b/include/types/server.h
index c697457..fb31215 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -1,23 +1,23 @@
 /*
-  include/types/server.h
-  This file defines everything related to servers.
-
-  Copyright (C) 2000-2009 Willy Tarreau - w@1wt.eu
-  
-  This library is free software; you can redistribute it and/or
-  modify it under the terms of the GNU Lesser General Public
-  License as published by the Free Software Foundation, version 2.1
-  exclusively.
-
-  This library is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
-*/
+ * include/types/server.h
+ * This file defines everything related to servers.
+ *
+ * Copyright (C) 2000-2011 Willy Tarreau - w@1wt.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
 
 #ifndef _TYPES_SERVER_H
 #define _TYPES_SERVER_H
@@ -53,6 +53,7 @@
 #define SRV_TPROXY_CLI	0x0300	/* bind to the client's IP+port to reach this server */
 #define SRV_TPROXY_DYN	0x0400	/* bind to a dynamically computed non-local address */
 #define SRV_TPROXY_MASK	0x0700	/* bind to a non-local address to reach this server */
+#define SRV_SEND_PROXY	0x0800	/* this server talks the PROXY protocol */
 
 /* function which act on servers need to return various errors */
 #define SRV_STATUS_OK       0   /* everything is OK. */