BUILD: http_ana: need to include proxy-t to get redirect_rule

The struct was only defined inside function arguments there and
inherited from other files.
diff --git a/include/haproxy/http_ana.h b/include/haproxy/http_ana.h
index 8ae501e..73425a6 100644
--- a/include/haproxy/http_ana.h
+++ b/include/haproxy/http_ana.h
@@ -26,6 +26,7 @@
 #include <haproxy/channel-t.h>
 #include <haproxy/http_ana-t.h>
 #include <haproxy/htx-t.h>
+#include <haproxy/proxy-t.h>
 #include <haproxy/stream-t.h>
 
 extern struct pool_head *pool_head_uniqueid;