Don't add module symbols to global namespace

The G_MODULE_BIND_LOCAL flag specifies that symbols in the module should not
be added to the global name space. The default action on most platforms is
to place symbols in the module in the global name space, which may cause
conflicts with existing symbols.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>