SDL_MapRGBA in sdlvideo.bi

[Sterling Christensen]

SDL_MapRGBA's declaration is missing the last parameter and it's alias is incorrectly all uppercase. It should be changed to this:

declare function SDL_MapRGBA cdecl alias "SDL_MapRGBA" ( byval format as SDL_PixelFormat ptr, byval r as ubyte, byval g as ubyte, byval b as ubyte, byval a as ubyte ) as uinteger