Video backends: remove dead code.

[magumagu]

Should all be obvious.

[degasus]

I think we shouldn't remove this code just because it's dead. We don't sync the gpu at all atm, but we'll have to. So in which way do we want to do this? As the removed is known to work a bit, it's maybe a useful reference.

[magumagu]

What bit in particular are you referring to as "known to work a bit"?

[neobrain]

@degasus Ping, please reply to @magumagu's question.

I think removing this dead code is useful indeed. Regardless whether it worked or just a bit or not at all, it seemed like it wasn't particularly sophisticated anyway. If anyone were interested in implementing the functionality properly, I think this code would be more confusing (potentially giving wrong clues as to how a proper implementation looks like) than actually helping.

LGTM hence.

@dolphin-emu-bot rebuild

[degasus]

Indeed, this code is likely wrong. so LGTM