FIX: Upstream Annex-B bitstream conversion fix for some BD mkv iso rips
FIX: fixup h264 bitstream; the whole prepend thing is causing problems
Guilib GraphicContext patch for Amlogic

This patch exports virtual width, height,
x and y of current settings (overscan).

These values are useful later in Linux build
in combination of AMlogic LibPlayer hosted at
https://github.com/Stane1983/amlogic-libplayer