aprsc 2.1.17: Fedora Core builds

[Heikki Hannikainen]

aprsc 2.1.17 is now available.

Upgrading on Debian / Ubuntu:

sudo apt-get update && sudo apt-get upgrade
sudo reboot (to run the new kernel if it was updated)

Upgrading on Fedora:

sudo dnf upgrade

FreeBSD:

http://he.fi/aprsc/down/

Changes in 2.1.17:

* Dropped support for CentOS 7, as the distribution is shut down.
CentOS Linux 7 will reach end of life (EOL) on June 30, 2024.
Since it won't be receiving security updates any more, servers
using it will need to be reinstalled to use a supported distribution.

https://www.redhat.com/en/topics/linux/centos-linux-eol

* Added support for Fedora CoreOS 39 & 40, to have support for
one RPM-based distribution for those preferring it. I haven't
tested this extensively myself, but the basic things seem to work.
Post bug reports here. Thanks!

* Switched to systemd unit files for the RPM builds.

* Use system-provided libevent2 in the RPM builds.

The installation instructions have been updated accordingly:

https://github.com/hessu/aprsc/blob/main/doc/INSTALLING.md

* Started building for Ubuntu 24.04 for those who might pick it
for a new server installation. 22.04 LTS -> 24.04 LTS upgrades will
probably start in August and we're now ready to go with that:

https://www.omgubuntu.co.uk/2024/05/ubuntu-24-04-upgrades-officially-open

- Hessu