Update Python on AT 11.0 and 12.0
Update Python on AT 11.0 and 12.0

Update to Python 3.6.12, from version 3.6.6.
This update requires changes to the lib64 patch and also requires a
patch that is used on earlier AT versions in order to ignore a test for
the zlib version.

Signed-off-by: Tulio Magno Quites Machado Filho <0e1b3d0765ee75ed64fa2e34822e4949a70a1429@linux.ibm.com>

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