patch nag: refcount neon module

[Christian Neumair <chris gnome-de org>]

Handling multiple methods in one module requires refcounting, which
currently isn't implemented properly for the neon method.
http://bugzilla.gnome.org/show_bug.cgi?id=347470 provides a patch.

Sidenote: We never g_module_close the modules opened for one
MethodElement. Since GModules are refcounted, we should be able to
safely close them in module_element_free, even when used with multiple
methods.

-- 
Christian Neumair <chris gnome-de org>