Fix "Deprecated: X.Y" without additional message

When we want to deprecate a symbol without adding an additional message,
like "Use blah() instead". It can be useful when there is no
replacement, or when we are lazy.

https://bugzilla.gnome.org/show_bug.cgi?id=707717
Test "Deprecated: X.Y" without additional message

https://bugzilla.gnome.org/show_bug.cgi?id=707717
Fix deprecation version without message

https://bugzilla.gnome.org/show_bug.cgi?id=707717