It was redundant because SDLActivity already inherits an empty method from the
base class SurfaceView (which does not implement it but inherits it from View).
Visibility of onDraw() in SDLActivity is now protected again instead of public.
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly
uninitialized data structure if loading the library first failed. A later try to
use EGL then skipped initialization and assumed it was previously successful
because the data structure now already existed. This led to at least one crash
in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was
dereferenced to make a call to eglBindAPI().
