Skip warning for some Adwaita icons for backward compatibility.
In SUSE Linux Enterprise we by default use adwaita-icon-theme as icon theme, and it contains some legacy icon for backward compatibility (e.g. icewm, xfce use them). Programs using kiconthemes will give user warning about it, which makes user confused. Looks like kiconthemes gives exception for Stock
, so this MR added Legacy
and UI
in Adwaita too to prevent those warnings.