Remove zlib from global octopus packages
In the new compilation for the production toolchains (24a) zlib was no longer
picked up as a dependency of netcdf-c (it is not clear why it happened
before) and this again results in a name clash when compiling the global
ocopus package. This MR reverts the changes from before and also adds a
global setting for zlib-api
(maybe that helps preventing the problem).
Related to !85 (merged)