derelict.sdl2: API update (SDL2 hg 177d1dc3dba6)
derelict.sdl2: Whitespace fixes
derelict.sdl2: Fix SDL_DEFINE_PIXELFORMAT
derelict.sdl2: API update (SDL2 hg ae9c4b12f3e2)
Merge pull request #94 from CyberShadow/fixes-20130308

SDL2 update and fixes