tests: Add tests for various struct typedef combinations

Add functional blackbox tests typedefs.[h|c] for various struct typedef
orderings. Use XFAIL_TESTS with the new Typedefs-1.0.gir target.
This allows for a differing expected gir that does not cause the suite
to fail but rather a goal to work towards.

https://bugzilla.gnome.org/show_bug.cgi?id=581525