Add support for AIX OS

[patel-parth7]

Describe the feature

To port aws-sdk-cpp on AIX OS, we have made the necessary changes in the aws-c-io module.

Use Case

AIX plans to add support for popular open-source libraries, enabling their direct use.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change