Android: Reducing non-buffered rendering frameskip flashing.

[ppssp213]

This is for using with the gamekeyboard touch controls instead of ppsspp's, using a real gamepad won't make any difference, ppsspp's touch controls have to be disabled though, it probably has something to do with how gamekeyboard touch controls overlay refreshes to the screen which helps with ppsspp screen flicker.

Another thing I noticed is the unthrottle control with ppsspp's touch control only increases framerate whilst it's held down, whilst the gamekeyboard L2 button shows an onscreen prompt of speed Alternative or Standard and locks it to the the Alternative speed percentage.