Revert "Remove obsolete Z_-definitions"
Revert "Remove obsolete Z_-definitions"

This reverts commit 1d2f32707c0d46f1fe11826fadbb2537fd90fac7.
We keep various definitions to preserve backwards compatibility.

nla/yaz,dcrossleyau/yaz,nla/yaz,nla/yaz,nla/yaz,dcrossleyau/yaz,dcrossleyau/yaz