xkeyboard-config: update to xkeyboard-config-2.9

Signed-off-by: Stephan Raue <stephan@openelec.tv>
xkeyboard-config: convert to new package format

Signed-off-by: Stephan Raue <stephan@openelec.tv>
scripts/build: globally remove /usr/share/pkgconfig from .install_pkg dir

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