zlib: update to upstream version 1.2.8

Only version number and release year changed in license text.

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>

diff --git a/meta/recipes-core/zlib/zlib-1.2.7/remove.ldconfig.call.patch b/meta/recipes-core/zlib/zlib-1.2.8/remove.ldconfig.call.patch
similarity index 100%
rename from meta/recipes-core/zlib/zlib-1.2.7/remove.ldconfig.call.patch
rename to meta/recipes-core/zlib/zlib-1.2.8/remove.ldconfig.call.patch