Release 0.8.1

Release 0.8.1

* Add sqlite and perl as dependencies for RPM/Debian packages (by @fatalbanana)
* Remove whitelist.lua from RPM file list (by @fatalbanana)
* Make Exim pass hostnames to rspamd (by @fatalbanana)
* Fix building on Fedora (by @fatalbanana)
* Add toggle for disabling installation of systemd units on Linux (by @fatalbanana)
* Fix double format rounding that caused output corruption (reported by @fatalbanana)
* Revert broken change for destructors ordering that led to memory corruption
* Do not reset symbols case of settings if parsed from lua (reported by @andrejzverev)
* Fix build on SunOS (by @wiedi)
* Fix multiple crashes on broken DKIM DNS records
* Fix critical issue with composites weights removing
* Fix memory corruption in composites processing code
* Ignore non-SPF TXT records when parsing SPF includes

Signed-off-by: Vsevolod Stakhov <vsevolod@highsecure.ru>