Android: correct libz dependency

Android: correct libz dependency

Commit 6facb0c0 ("android: fix libz dynamic library dependencies")
unconditionally adds libz as a dependency to all shared libraries.
That is unnecessary.

Commit 85a9b1b5 introduced libz as a dependency to libmesa_util.
So only the shared libraries that use libmesa_util need libz.

Fix Android Lollipop build by adding the include path of zlib to
libmesa_util explicitly instead of getting the path implicitly
from zlib since it doesn't export the include path in Lollipop.

Fixes: 6facb0c0 "android: fix libz dynamic library dependencies"
Signed-off-by: Chih-Wei Huang <cwhuang@linux.org.tw>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Rob Herring <robh@kernel.org>