[yocto] [meta-intel] Add Xorg ABI dependencies

[Ross Burton]

Hi,

Following are patches against master (*not* danny) to add runtime dependencies
on the Xorg ABI version to the binary drivers, a symbol that the Xorg server
provides.

This means that mismatching server/driver ABIs becomes a package dependency
issue and thus image-time error, instead of a boot time error.

Note that these ABI versions are calculated from the Xorg server version that
the drivers were compiled against and need to be verified and updated manually
when the driver is upgraded.

Ross