MDEV-12305 + others = Hurd upstream misc patches

[grooverdan]

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• [x] The Jira issue number for this PR is: MDEV-12305

Description

Take Debian carried patches for Hurd compatibility and apply as is.

Release Notes

Hurd compatibly applied

How can this PR be tested?

Debian hurd

Basing the PR against the correct MariaDB version

• [ ] This is a new feature or a refactoring, and the PR is based against the main branch.
• [X] This is a bug fix, and the PR is based against the earliest maintained branch in which the bug can be reproduced.

PR quality check

• [X] I checked the CODING_STANDARDS.md file and my PR conforms to this where appropriate.
• [X] For any trivial modifications to the PR, I am ok with the reviewer making the changes themselves.

https://www.gnu.org/software/hurd/hurd/porting/guidelines.html for GNU being the right define for Hurd.