MEDIUM: lua: lua integration in the build and init system.

This is the first step of the lua integration. We add the useful
files in the HAProxy project. These files contains the main
includes, the Makefile options and empty initialisation function.
Is is the LUA skeleton.
diff --git a/src/haproxy.c b/src/haproxy.c
index f50deff..7656167 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -88,6 +88,9 @@
 #include <proto/connection.h>
 #include <proto/fd.h>
 #include <proto/hdr_idx.h>
+#ifdef USE_LUA
+#include <proto/hlua.h>
+#endif
 #include <proto/listener.h>
 #include <proto/log.h>
 #include <proto/pattern.h>
@@ -558,6 +561,11 @@
 	init_pendconn();
 	init_proto_http();
 
+#ifdef USE_LUA
+	/* Initialise lua. */
+	hlua_init();
+#endif
+
 	global.tune.options |= GTUNE_USE_SELECT;  /* select() is always available */
 #if defined(ENABLE_POLL)
 	global.tune.options |= GTUNE_USE_POLL;