#51 new feature breaks Linux compilation about fceux

[owomomo]

I forgot the add the implement to the sdl version, though it only returns 0. You can test if it was fixed and post details if it still has errors.

[noabody]

Compile is perfect now. Thank you so much! It must be a tremendous pain to work with multi-platform code like this. I wish I could do more than identify issues.

[jaygarcia]

@noabody please close this issue when you have a moment :).