[tlbuild] Github Action fails for x86_

[Bruno Haible]

Karl Berry wrote:
> Unless a reasonably supported Debian|other version has an older libc.
> Looks like Alma 8's glibc is 2.28.

Yes, glibc version 2.28 is the oldest one people may reasonably use, as of now:

2.26  Fedora 27, openSUSE 15.2, Ubuntu 17.10
2.27  ElementaryOS 5.0, Ubuntu 18.04
2.28  Centos 8, Debian 10, Fedora 28, Guix 1.0, Manjaro 17
2.29  Fedora 30, Guix 1.1
2.30  Arch 19.11, Fedora 31
2.31  Debian 11, Fedora 32, Ubuntu 20.04, openSUSE 15.5
2.32  Fedora33, Ubuntu 20.10
2.33  Slackware 15
2.34  Alma 9, CentOS Stream 9, Ubuntu 21.10
2.35  Fedora 36, Ubuntu 22.04
2.36  Fedora 37, Ubuntu 22.10, Debian 12
2.37  Ubuntu 23.04
2.38  Ubuntu 23.10
2.39  Arch 24.04, Manjaro 23, Fedora 40, Ubuntu 24.04
(See also https://repology.org/project/glibc/versions .)

Debian 10 also has version 2.28, but is already end-of-life.

Bruno