Allocate the memory for a new SDLRenderer, it must then be freed with free

Property definitions

sdl2 $ SDLRendererInfo :: malloc
	# Allocate the memory for a new `SDLRenderer`, it must then be freed with `free`
	new malloc `{ return malloc(sizeof(SDL_RendererInfo)); `}
lib/sdl2/sdl2_base.nit:580,2--581,58