MDEV-34287: Update debian/copyright to be compatible with Dep-5

[illuusio]

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• [x] The Jira issue number for this PR is: MDEV-34287

Description

Update Debian machine readable copyright information to be compatible with Dep-5 standard. This PR focuses C, C headers and shell scripts. There is plenty of Perl script which should be applied in next round.

Release Notes

Probably nothing as this is kind of update of information not a change of anything.

How can this PR be tested?

Clone repo and install makedep tool with apt install makedep then go to repo dir and run makedep -k which should be executed without any warnings or errors.

Basing the PR against the correct MariaDB version

• [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.