gobject, tests: add tests for autoptr (and lists) with declared

Add tests using an object declared with G_DECLARE_FINAL_TYPE, that is derived
from another, declared using G_DECLARE_DERIVABLE_TYPE, and that
thus uses _GLIB_DEFINE_AUTOPTR_CHAINUP to define cleanup functions.

And verify that both g_autoptr(Type) and g_auto(s)list(Type) work

gobject/tests/meson.build

@@ -51,6 +51,10 @@ gobject_tests = {
   },
 }
 
+if cc.get_id() != 'msvc'
+  gobject_tests += {'autoptr' : {}}
+endif
+
 # FIXME: put common bits of test environment() in one location
 # Not entirely random of course, but at least it changes over time
 random_number = minor_version + meson.version().split('.').get(1).to_int()