SDL_GetNumJoystickHats returns 0 with emscripten

[brccabral]

Hi, I was checking examples/input/01-joystick-polling/joystick-polling.c and SDL_GetNumJoystickHats returns 1 when compiling for Linux but 0 when compiling for Emscripten.
Is it a bug in SDL or is it not supported in Emscripten?

[icculus]

I don't think Emscripten exposes hats...? I'll have to check.