What's new in at-spi2-core 2.37.90:
* Add a mode-changed signal to allow a screen reader to indicate
that its mode has changed.
* Fix use after free when a device listener is destroyed (#22).
* Meson: de-duplicate deps of 'Requires' in pkgconfig file (!28).
* FIx use after free when an event listener is destroyed.
* Make at-spi-dbus-bus.desktop validate (!30).
* atspi_accessible_set_cache_mask: relax assert that was generating a
warning and causing the function to fail in some cases.
* Fixes for synthesizing keys.
* Fix Qt annotations in DBus xml files.
* Memory test: replace gedit with a light-weight test application.
* dbtest: print to stdout instead of stderr.
* Tests: make test a bit verbose.
* Constants: fix typos in two _COUNT constants.