linux: update to linux-3.8.7

Signed-off-by: Stephan Raue <stephan@openelec.tv>
gcc: update to gcc-4.7.3

Signed-off-by: Stephan Raue <stephan@openelec.tv>
ffmpeg: move patches in own versioning dir

Signed-off-by: Stephan Raue <stephan@openelec.tv>