Bug 3385

The GL stack isn't ideal and needs work.  Mainly based on the discussion on oe-core:

== Unambiguous package names

No GL stack should result in for example a "libgl.ipk" when Debian-renaming is enabled. The ross/mesa branch on poky-contrib has a commit to make Mesa's packages have a -mesa suffix, even when debian-renaming.  This needs a test.  The same should be done to the drivers in meta-intel but for now they are bundled into a single package so the renaming isn't a problem.  Finally dig into the bigger non-Intel BSPs and prod them to do the same - for example meta-ti.

== EGL/GLES everywhere

Mesa should always build EGL and GLES drivers.  At the moment this is a x86-specific override, so make this generic.  The package names being unique will resolve the problems that this originally caused.

== More virtual/ build depends

We need a virtual/foo build dependency for every variation of GL, not just virtual/libgl.  Mesa provides everything, so it should provide virtual/libgl virtual/libegl virtual/libgles1v irtual/libgles2.  The EMGD drivers provide EGL and GLES1/2, there's a patch in meta-intel-contrib:ross/emgd which needs testing.  The same needs to be done to cdv-pvr-driver.  All users of virtual/libgl should be verified that the dependencies are actually correct.  Finally, mail oe-core/oe-devel/BSPs to inform them of these new dependencies.

== Rename mesa-dri to mesa

mesa-dri is a artefact of mesa-xlib existing, which doesn't anymore.  mesa-dri should be renamed to mesa.  It's expected that meta-intel will soon gain it's own packaging of mesa as the binary drivers have very strict requirements, so coordination there will be needed.