Work around possible lack of GLib::Array.get_element_size.
Work around possible lack of GLib::Array.get_element_size.

The same C function is available as GLib.array_get_element_size.

jcupitt/gir_ffi,mvz/gir_ffi,mvz/gir_ffi,jcupitt/gir_ffi,mvz/gir_ffi