GC_UNLOAD build time define and replaced with flag to change it at runtime.

src/core.c

@@ -1253,6 +1253,17 @@ int lcoreIsGCUnloadEnabled( lua_State *L ) {
 	return 1;
 }
 
+/*
+> RL.SetGCUnload( bool enabled )
+
+Set Lua garbage collection to unload object data
+*/
+int lcoreSetGCUnload( lua_State *L ) {
+	state->gcUnload = uluaGetBoolean( L, 1 );
+
+	return 0;
+}
+
 /*
 ## Core - Files management functions
 */