REORG: include: move proto_tcp.h to haproxy/proto_tcp.h

There was no type file. This one really is trivial. A few missing
includes were added to satisfy the exported functions prototypes.
diff --git a/src/frontend.c b/src/frontend.c
index 4066fe9..050a08f 100644
--- a/src/frontend.c
+++ b/src/frontend.c
@@ -37,7 +37,7 @@
 #include <proto/channel.h>
 #include <haproxy/fd.h>
 #include <proto/log.h>
-#include <proto/proto_tcp.h>
+#include <haproxy/proto_tcp.h>
 #include <proto/http_ana.h>
 #include <proto/proxy.h>
 #include <proto/stream.h>