giobjectinfo: Add missing transfer annotation to find_signal ()
Update glib annotations from git master
tests: Switch two more uses to LOG_COMPILER to fix parallel-tests

This is similar to previous commits; we need to use LOG_COMPILER in
order for Automake's parallel-tests framework to work.  It's not
allowed to include binaries in TESTS_ENVIRONMENT anymore.
Release 1.39.3
Add test passing an owned boxed structure to a callback

https://bugzilla.gnome.org/show_bug.cgi?id=722899