zlib: don't use version script
some stuff in base depends on symbols that are not exported by default.
examples:
/usr/lib/amd64/libficl-sys.so.4.1.0: undefined reference to `inflateInit_@libz.so.1'
/usr/lib/amd64/libficl-sys.so.4.1.0: undefined reference to `crc32@libz.so.1'
/usr/lib/amd64/libficl-sys.so.4.1.0: undefined reference to `inflate@libz.so.1'
/usr/lib/amd64/libficl-sys.so.4.1.0: undefined reference to `inflateEnd@libz.so.1'
/lib/amd64/libzfs.so.1: undefined reference to `uncompress@SUNW_1.1'
so just skip using the version script for now.