Fixed issue of redefinition warning messages for _GNU_SOURCE

[nileshkale123]

Description

This commit solves the issue of redefinition warning messages for _GNU_SOURCE while building on Linux platform.

PR checklist

Please tick as appropriate and edit the reasons (e.g.: "backport: not needed because this is a new feature")

• [x] changelog provided
• [x] 2.28 backport this is the 2.28 backport of #9026
• [x] 3.6 backport #9085
• [x] tests not required

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[tom-daubney-arm]

Hi @nileshkale123, thanks for this too. Similarly we have some CI failures that need addressing. Thanks

[tom-cosgrove-arm]

Thanks for doing the backports.

We'd normally expect all of the commits from the original PR to be backported; people typically use either git cherry-pick (good for single commit or small range) or git rebase --onto