Log Message:
unrealircd: update to 5.2.2

UnrealIRCd 5.2.2 Release Notes
===============================

This 5.2.2 release only contains some minor changes.

Fixes:
* Fix issues with Let's Encrypt certificates for
  [remote includes](https://www.unrealircd.org/docs/Remote_includes) (quite
  common) and with linking to servers with link::verify-certificate enabled
  (more rare). Both issues only happen with:
  * OpenSSL 1.0.2 and older, which is officially unsupported, but still in
    use on e.g. Debian 8 and Ubuntu 16.04.
  * LibreSSL, such as with UnrealIRCd on Windows
* OpenBSD compile issue when using shipped c-ares

Enhancements:
* [set::allowed-nickchars](https://www.unrealircd.org/docs/Nick_Character_Sets):
  added ```arabic-utf8```
* \ 
[set::server-linking](https://www.unrealircd.org/docs/Set_block#set::server-linking):
  add another autoconnect-strategy called ```sequential-fallback```.

Module coders / IRC protocol:
* S2S: Allow ```SVSLOGIN``` also when
 [set::sasl-server](https://www.unrealircd.org/docs/Set_block#set::sasl-server)
 is not set.
* Some minor ```CHATHISTORY``` fixes, for example the subcommand is now
  case-insensitive.
* You can use the new ```UNREAL_VERSION``` macro. It is easier than the
  old individual UNREAL_VERSION_MAJOR/MINOR/etc macros.