Update zlib to rev 78 via SR 830216
https://build.opensuse.org/request/show/830216
by user scarabeus_iv + dimstar_suse
- Add patch to fix compression level switching
bsc#1175811 bsc#1175830 bsc#1175831
* zlib-compression-switching.patch
- Set -DDFLTCC_LEVEL_MASK=0x7e on s390/s390x jsc#13776