tiff: downgrade to tiff-3.9.7

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: update to xbmc-12.0.2

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: update to linux-3.7.9

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