Update zlib to 1.2.11

Changes in 1.2.11 (15 Jan 2017)
- Fix deflate stored bug when pulling last block from window
- Permit immediate deflateParams changes before any deflate input

These changes fixed regressions caused by the 1.2.10 update in
58fbca4f which was subsequently
reverted.

Bug: 34098691
Test: make
Test: run cts -m CtsLibcoreTestCases
Change-Id: Ie7818a7c0e072d4098ec4052ef212b5334e6c685