[#2616] Added AIX 7.1 support.

Problem?
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No support for AIX 7.1.

Solution?
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Imported updated `paver.sh` from `python-package` where AIX 7.1 is now supported.

**Drive-by fix**:
  * fixed arch name for AIX 5.3

How to test?
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Please review changes.

reviewer: @adiroiban