Fix native delegate callback getting garbage collected
Fix native delegate callback getting garbage collected

ppy/osu-framework,ppy/osu-framework,ZLima12/osu-framework,ppy/osu-framework,smoogipooo/osu-framework,peppy/osu-framework,peppy/osu-framework,ZLima12/osu-framework,peppy/osu-framework,smoogipooo/osu-framework