lib-lua: Define LUA_OK if missing

It's defined since lua 5.2, and we support lua 5.1.

diff --git a/src/lib-lua/dlua-compat.h b/src/lib-lua/dlua-compat.h
index e41509656610e22de870d73a88ba88197594496d..6204429c85a474b2fc051696602e93170f16d1b6 100644 (file)
--- a/src/lib-lua/dlua-compat.h
+++ b/src/lib-lua/dlua-compat.h
@@ -5,6 +5,10 @@
  * In general, make whatever Lua version we have behave more like Lua 5.3.
  */
 
+#if !defined(LUA_OK)
+#  define LUA_OK 0
+#endif
+
 /* functionality missing from <= 5.2 */
 #if LUA_VERSION_NUM <= 502
 #  define luaL_newmetatable(L, tn) \