Add more SDL2 native functions
Add more SDL2 native functions

Veldrid does not expose all the functions we will need.

EVAST9919/osu-framework,smoogipooo/osu-framework,EVAST9919/osu-framework,peppy/osu-framework,EVAST9919/osu-framework,ppy/osu-framework,smoogipooo/osu-framework,peppy/osu-framework,ZLima12/osu-framework,ppy/osu-framework,peppy/osu-framework,ZLima12/osu-framework,ppy/osu-framework,EVAST9919/osu-framework