fstack-protector-strong WIP

[mbrousset-ledger]

Description

Please provide a detailed description of what was done in this PR.
(And mention any links to an issue docs)

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• Other (for changes that might not fit in any category)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it.

Additional comments

Please post additional comments in this section if you have them, otherwise delete it.

Auto cherry-pick in API_LEVEL

If requested to port the commits from this PR on a dedicated API_LEVEL branch,
select the targeted one(s), or add new references if not listed:

[ ] TARGET_API_LEVEL: API_LEVEL_25

This will only create the PR with cherry-picks, ready to be reviewed and merged.

Remember:

• The merge will ALWAYS be a manual operation.
• It is possible the cherry-picks don't apply correctly, mainly if previous commits have been forgotten.
• In case of failure, there is no other solution than redo the operation manually...

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.52%. Comparing base (4211d91) to head (0f7a0a2).

Additional details and impacted files

@@              Coverage Diff              @@
##           mbr/clang-21    #1457   +/-   ##
=============================================
  Coverage         82.52%   82.52%           
=============================================
  Files                46       46           
  Lines              5670     5670           
  Branches            774      774           
=============================================
  Hits               4679     4679           
  Misses              934      934           
  Partials             57       57           

Flag	Coverage Δ
unittests	82.52% <ø> (ø)

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