iox-#2011 Remove gcc 5.4 and std_header_check.sh from CI

[elBoberido]

Pre-Review Checklist for the PR Author

1. Code follows the coding style of CONTRIBUTING.md
2. Tests follow the best practice for testing
3. Changelog updated in the unreleased section including API breaking changes
4. Branch follows the naming format (iox-123-this-is-a-branch)
5. Commits messages are according to this guideline
   • Commit messages have the issue ID (iox-#123 commit text)
   • Commit author matches Eclipse Contributor Agreement (and ECA is signed)
6. Update the PR title
   • Follow the same conventions as for commit messages
   • Link to the relevant issue
7. Relevant issues are linked
8. Add sensible notes for the reviewer
9. All checks have passed (except task-list-completed)
10. All touched (C/C++) source code files from iceoryx_hoofs are added to ./clang-tidy-diff-scans.txt
11. Assign PR to reviewer

Notes for Reviewer

This PR removes the GCC 5.4 CI check and std_header_check.sh

Checklist for the PR Reviewer

• Commits are properly organized and messages are according to the guideline
• Code according to our coding style and naming conventions
• Unit tests have been written for new behavior
• Public API changes are documented via doxygen
• Copyright owner are updated in the changed files
• All touched (C/C++) source code files from iceoryx_hoofs have been added to ./clang-tidy-diff-scans.txt
• PR title describes the changes

Post-review Checklist for the PR Author

1. All open points are addressed and tracked via issues

References

• Relates to Ongoing Issue: CI Maintenance Tasks #2011

[elBoberido]

@dkroenke @mossmaurice There are still toolchain files for QNX 7.0. I can't update them to QNX 7.1 since I don't have access but also don't want to remove them since it might help someone else at porting.

[codecov]

Codecov Report

Merging #2024 (e3e9efd) into master (c5d1340) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2024      +/-   ##
==========================================
- Coverage   74.27%   74.26%   -0.01%     
==========================================
  Files         413      413              
  Lines       16055    16055              
  Branches     2246     2246              
==========================================
- Hits        11925    11924       -1     
  Misses       3411     3411              
- Partials      719      720       +1     

Flag	Coverage Δ
unittests	74.05% <ø> (-0.01%)	⬇️
unittests_timing	15.25% <ø> (ø)

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see 1 file with indirect coverage changes

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[mossmaurice]

There are still toolchain files for QNX 7.0. I can't update them to QNX 7.1 since I don't have access but also don't want to remove them since it might help someone else at porting.

@elBoberido Could you create a issue for that and maybe add a @todo to the toolchain file?

[mossmaurice]

LGTM, thanks for the PR!