These both existed in 2.34.1, but are not exposed in headers, and were
meant to be private. Making them static (in commit 84475e43) was
technically an ABI break, and in particular it causes abicheck.sh to fail.
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=687441
Reviewed-by: Colin Walters <walters@verbum.org>
There was a /* XXX */ in the code here to do proper typechecking of the
GVariant in the menu model when using g_menu_model_get_item_attribute().
We have g_variant_check_format_string() now, so use it.