libdrm: update to libdrm-2.4.56

Signed-off-by: Stephan Raue <stephan@openelec.tv>
ffmpeg: update to ffmpeg-2.3.1

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: update to linux-3.15.8
gdb: update to gdb-7.8

Signed-off-by: Stephan Raue <stephan@openelec.tv>
binutils: remove unused cloog and ppl support for now

Signed-off-by: Stephan Raue <stephan@openelec.tv>
gcc: remove unused cloog and ppl support for now

Signed-off-by: Stephan Raue <stephan@openelec.tv>
remove package 'ppl'

Signed-off-by: Stephan Raue <stephan@openelec.tv>
remove package 'cloog'

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