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 #9086
• [x] 3.6 backport this is the 3.6 backport of #9026
• [x] tests not required

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[tom-daubney-arm]

Hi @nileshkale123, thanks for putting this up. We have some CI failures here, could you please look into them?