Win32 version: disable bilinear interpolation?

[Yave-Yu]

If disable hardware, bilinear will disappear but less smooth motion, sync method seems useless, unlike regular VSync like other emulator does. Enable hardware will make motion more smooth, but bilinear will appear. I can use Prescale filter, but it has 4x max, not suitable for higher resolution with bigger window size (more than 4x), so add a switch to enable/disable bilinear interpolation would be better.