function: Add more support for out pointers
function: Add more support for out pointers

Allow calling gtk_init, even if we throw the result away.

romgrk/node-gtk,romgrk/node-gtk,WebReflection/node-gtk-cc,romgrk/node-gtk,romgrk/node-gtk,WebReflection/node-gtk-cc,romgrk/node-gtk,WebReflection/node-gtk-cc