Imported unwind library from https://github.com/libunwind/libunwind, rev. 2934cf40529e0261801a4142fabae449a65effd0 [#CLICKHOUSE-3094].

This avoids symbol conflict when linking external applications that use another
variant of CityHash in the global namespace with ClickHouse libraries.

* Try fix freebsd 11-STABLE OCbuild

* Fix freebsd and macos build (contrib/libbtrie)

This commit implements a basic IP prefix dictionary
that allows storing IPv4/IPv6 prefixes and
matching them against a single IP address on query
time. This allows for doing IP -> ASN matching and
other similar things on query time.

The implementation is basic for start, using a
simple bitwise trie and reusing interface for
complex key dictionaries (so using tuple instead
of UInt32/FixedString(16) as the key). A faster
bitwise trie implementation (like poptrie) is
desired to improve lookup performance and
memory consumption with large prefix tables.

the last stable version 1.7.8 fixes build with
newer OpenSSL that’s in most of the distribution

* Fix build in gcc7

* try reduce warn area

* better fix

See https://issues.apache.org/jira/browse/ZOOKEEPER-706 for details.

* freebsd fixes

* Update SocketImpl.cpp

* Allow build with external double-conversion lz4 zstd re2 zookeeper

* fix

* fix

* freebsd fixes

* spaces

* fix

* fix

* fix

* wip

* move

* fix

* Cmake: UNBUNDLED option

* Dynamic library mode

* Correct fix of building with external poco with disabled sending progress

    Revert "Removed wrong code [#CLICKHOUSE-2]."

    This reverts commit 33f9917f.

* fix

* fix

* cmake: USE_INTERNAL_ZLIB_LIBRARY

Imported CCTZ library from https://github.com/google/cctz/tree/90ef68be6deb181fc37e6a0d76fdcd0c6b847d38 [#CLICKHOUSE-2].

* Manual version update to [54135]

* Temporary release script fix [#METRIQA-732]

* cmake: remove add_definitions(-DNO_TCMALLOC), instead use ENABLE_LIBTCMALLOC from config

Fix some errors in apple build

* Freebsd clang3.8 compile fixes

* clean

* fix

* fix clang build