native: Remove support for nested native modules
native: Remove support for nested native modules

Now that all modules are guaranteed to be static and toplevel,
we can remove a large set of code that's been around simply
for support for nested native modules.

https://bugzilla.gnome.org/show_bug.cgi?id=694873

pixunil/cjs,endlessm/gjs,pixunil/cjs,endlessm/gjs,djdeath/gjs,mtwebster/cjs,endlessm/gjs,pixunil/cjs,pixunil/cjs,djdeath/gjs,mtwebster/cjs,endlessm/gjs,endlessm/gjs,djdeath/gjs,mtwebster/cjs,pixunil/cjs,mtwebster/cjs,mtwebster/cjs,djdeath/gjs,djdeath/gjs