- Rebuild to ensure libGLU gets rebuilt with new gcc with C++ compiler
        fixes.
    - Changed the 3 devel packages to use Obsoletes instead of Conflicts for
        the packages the files used to be present in, as this is more friendy
        for OS upgrades.
    - Added "Requires: libX11-devel" to mesa-libGL-devel package (#173712)
    - Added "Requires: libGL-devel" to mesa-libGLU-devel package (#175253)