Use Linux 6.16, GCC 15, binutils 2.45 in build-many-glibcs.py

[Andreas Schwab]

On Jul 29 2025, Joseph Myers wrote:

> Tested with build-many-glibcs.py (host-libraries, compilers and glibcs
> builds).

Ok.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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