[tlbuild] x86_64-linux builder

[Karl Berry]

    The problems had been caused by shared libraries.

Indeed.  And I thought that libc was one of those libraries.

    Kernel or libc version numbers are absolutely irrelevant.

I asked for anything relevant.  If you know what's relevant, why didn't
you send it?

Anyway, now that you've sent this contrarian statement, I seem to recall
that X11 shared library versions were another issue.  Is that right?

Tigran, CVR, Hartmut, anyone else willing?

Thanks,
Karl