[media-tv/xbmc] drop our custom version (using internal libs)

Hope it will be no longer needed and it will keep working with
system libraries. Otherwise, please resurrect.
[sys-fs/udev-init-scripts] version bump, keep our 2.6.32-fixup patch
[sys-fs/udev-init-scripts] add missing inherit
[sys-apps/openrc] version bump to 0.11.8
[media-tv/xbmc] override the Portage ebuild, use internal libs
[sys-kernel/*] bump 3.7 kernels to 3.7.4