gtk-sys: test failed on fedora copr

[ghost]

Bug description
https://download.copr.fedorainfracloud.org/results/remilauzier/gtk/fedora-rawhide-x86_64/02305848-rust-gtk-sys/builder-live.log.gz

tests/layout.c:244:61: error: 'GtkHeaderBarAccessible' undeclared (first use in this function); did you mean 'GtkLevelBarAccessible'?
244 | printf("%s;%zu;%zu\n", "GtkHeaderBarAccessible", sizeof(GtkHeaderBarAccessible), alignof(GtkHeaderBarAccessible));
| ^~~~~~~~~~~~~~~~~~~~~~
| GtkLevelBarAccessible
tests/layout.c:244:61: note: each undeclared identifier is reported only once for each function it appears in

[sdroege]

The corresponding header is not included by any GTK headers, so this fails (not just on Fedora copr). The header would have to be listed in the .gir file somehow so that it can be automatically included for the tests.

[sdroege]

I.e. this is a bug at the GTK level, not in the bindings.

[bilelmoussaoui]

There is already an issue about this #13