CLEANUP: frontend: remove the old proxy protocol decoder
This one used to rely on a stream analyser which was inappropriate.
It's not used anymore.
diff --git a/include/types/channel.h b/include/types/channel.h
index c68f4f7..a21e13f 100644
--- a/include/types/channel.h
+++ b/include/types/channel.h
@@ -140,7 +140,7 @@
* The field is blanked by channel_init() and only by analysers themselves
* afterwards.
*/
-#define AN_REQ_DECODE_PROXY 0x00000001 /* take the proxied address from a 'PROXY' line */
+/* unused: 0x00000001 */
#define AN_REQ_INSPECT_FE 0x00000002 /* inspect request contents in the frontend */
#define AN_REQ_WAIT_HTTP 0x00000004 /* wait for an HTTP request */
#define AN_REQ_HTTP_PROCESS_FE 0x00000008 /* process the frontend's HTTP part */