[Minor] debian/control: Update Vcs-Git URL and maintainer
* Let Vcs-Git point to a secure transport.
* Use Vsevolod's email address as maintainer to avoid having to patch
this file in rspamd_build.sh. Mikhail is not the current maintainer of
the Debian package anyway.
[Minor] Debian: update arches and versions in build dependencies
* glib 2.28 is the current minimum declared in CMakeLists.txt, but even
Jessie satisfies that requirement. Remove it.
* Use DEB_HOST_ARCH for "The Debian architecture of the host machine"
instead of DEB_TARGET_ARCH which is relevant for cross-compiling only.
* Update luajit arches based on https://packages.debian.org/sid/luajit
* Added arm64, mips64el, ppc64, ppc64el (stretch-backports / buster).
* Removed kfreebsd-i386 and 32-bit powerpc (removed in Jessie).
* Removed powerpcspe (unofficial port with outdated luajit).
* Maintained mips (removed after buster).
dh-systemd is a transitional package and moved into debhelper, so remove
it. This is supported since Debian Stretch. This change has to be
reversed if Debian Jessie or Ubuntu Xenial have to be supported.
[Minor] Debian: Enable Hyperscan and parallel builds
Debian 9 (Stretch) ships with Hyperscan 4.4.1, Ubuntu 18.04 ships with
Hyperscan 4.7.0. Follow rspamd's official recommendation and enable
support for these.
The --parallel option has been supported since 2009 and works perfectly
with CMake, so enable it by default.