Brew MP 1.0.2
Pushes a light userdata, represented as a void pointer, onto the Lua
stack. Unlike full userdata, a light userdata is not memory managed
by Lua, does not have an individual metatable and is not garbage
collected. Equality is defined as having the same raw pointer address.
void ILuaEx_PushLightUserData(ILuaEx *pif, void *p)