zfs zlib and net/zlib conflict

[Sean Bruno]

Hey, noted that DDB_CTF and ZFS are one cause of zlib conflict
currently.

I guess, for now, I can't have CTF *and* ZFS in my kernconf, which is
ok, I guess.  

I can see that there will be some issues until someone can untangle zlib
as sys/conf/files will drag in zlib from net in the following options:

net/zlib.c                      optional crypto | geom_uzip | ipsec | \
                                         mxge | netgraph_deflate | \
                                         ddb_ctf | gzio |geom_uncompress

Thoughts?

Sean