Recommended update for zlib

This update for zlib fixes the following issues:

- Fix compression level switching (bsc#1175811, bsc#1175830, bsc#1175831)
- Enable hardware compression on s390/s390x (jsc#SLE-13776)

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1175830
SLES 15 SP2 - zlib: DFLTCC compression level switching issues
bnc#1175811
SLES 12 SP5 - zlib: DFLTCC compression level switching issues
bnc#1175831
SLES 15 SP1 - zlib: DFLTCC compression level switching issues
Selected Binaries
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