MINOR: lua: remove some #define

The #define compilation directives are centralized in the hlua
include files. This permits to remove ome #ifdef from the haproxy
main code.
diff --git a/include/proto/hlua.h b/include/proto/hlua.h
index 50d6aa3..b9530aa 100644
--- a/include/proto/hlua.h
+++ b/include/proto/hlua.h
@@ -1,13 +1,28 @@
 #ifndef _PROTO_HLUA_H
 #define _PROTO_HLUA_H
 
+#ifdef USE_LUA
+
 #include <lua.h>
 
 #include <types/hlua.h>
 
+#define HLUA_INIT(__hlua) do { (__hlua)->T = 0; } while(0)
+
 /* Lua HAProxy integration functions. */
 void hlua_ctx_destroy(struct hlua *lua);
 void hlua_init();
 int hlua_post_init();
 
+#else /* USE_LUA */
+
+#define HLUA_INIT(__hlua)
+
+/* Empty function for compilation without Lua. */
+static inline void hlua_init() { }
+static inline int hlua_post_init() { return 1; }
+static inline void hlua_ctx_destroy() { }
+
+#endif /* USE_LUA */
+
 #endif /* _PROTO_HLUA_H */
diff --git a/include/types/hlua.h b/include/types/hlua.h
index d0e0348..2257d5c 100644
--- a/include/types/hlua.h
+++ b/include/types/hlua.h
@@ -1,6 +1,8 @@
 #ifndef _TYPES_HLUA_H
 #define _TYPES_HLUA_H
 
+#ifdef USE_LUA
+
 #include <lua.h>
 #include <lauxlib.h>
 
@@ -121,4 +123,12 @@
 	struct channel *chn;
 };
 
+#else /* USE_LUA */
+
+/* Empty struct for compilation compatibility */
+struct hlua { };
+struct hlua_socket { };
+
+#endif /* USE_LUA */
+
 #endif /* _TYPES_HLUA_H */
diff --git a/include/types/session.h b/include/types/session.h
index ad31ae2..8aa20bd 100644
--- a/include/types/session.h
+++ b/include/types/session.h
@@ -33,10 +33,7 @@
 
 #include <types/channel.h>
 #include <types/compression.h>
-
-#ifdef USE_LUA
 #include <types/hlua.h>
-#endif
 #include <types/obj_type.h>
 #include <types/proto_http.h>
 #include <types/proxy.h>
@@ -164,9 +161,7 @@
 	struct list *current_rule_list;		/* this is used to store the current executed rule list. */
 	struct list *current_rule;		/* this is used to store the current rule to be resumed. */
 
-#ifdef USE_LUA
 	struct hlua hlua;			/* lua runtime context */
-#endif
 };
 
 #endif /* _TYPES_SESSION_H */
diff --git a/include/types/stream_interface.h b/include/types/stream_interface.h
index ab0e750..03cdd6e 100644
--- a/include/types/stream_interface.h
+++ b/include/types/stream_interface.h
@@ -27,9 +27,7 @@
 
 #include <types/channel.h>
 #include <types/connection.h>
-#ifdef USE_LUA
 #include <types/hlua.h>
-#endif
 #include <types/obj_type.h>
 #include <common/config.h>
 
@@ -153,14 +151,12 @@
 			struct pattern_expr *expr;
 			struct chunk chunk;
 		} map;
-#ifdef USE_LUA
 		struct {
 			int connected;
 			struct hlua_socket *socket;
 			struct list wake_on_read;
 			struct list wake_on_write;
 		} hlua;
-#endif
 	} ctx;					/* used by stats I/O handlers to dump the stats */
 };