scripts/build: add support to build hosttools and initramfs packages

Signed-off-by: Stephan Raue <stephan@openelec.tv>
various packages: a bit cosmetics here and there

Signed-off-by: Stephan Raue <stephan@openelec.tv>
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
Merge branch 'master' of github.com:OpenELEC/OpenELEC.tv
Mesa: update to Mesa-c325aa5, update VDPAU interop patches

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xbmc: build with 4 cores only

Signed-off-by: Stephan Raue <stephan@openelec.tv>
plymouth-lite: update default bootsplash, thanks to 'Klojum'

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