znc: add configure options (#48683)

* znc: add option to disable IPv6

* znc: add option to enable debugging

* znc: add option to enable zlib support

* zncModules: match znc build inputs

znc-buildmod expects modules to be aware of the same libs znc itself is linked to.
Before this: znc-buildmod was passing -lz but zlib was not in the include path