Load LuaJIT FFI library

Author: MaximDude

Managers/LuaMan.cpp

@@ -34,6 +34,7 @@ namespace RTE {
 			{ LUA_MATHLIBNAME, luaopen_math },
 			{ LUA_DBLIBNAME, luaopen_debug },
 			{ LUA_JITLIBNAME, luaopen_jit },
+			{ LUA_FFILIBNAME, luaopen_ffi },
 			{ NULL, NULL } // End of array
 		};