[Swan-dev] heads up fedora builds (and testing) now require libseccomp-devel

[Andrew Cagney]

This may mean that your test VMs require an update before libreswan
can build again.

The symptom for needing a VM update is the build failing with a
missing secomp header file.  Two ways to fix it:

method #1 for when you have a single build tree: rebuild everything

$ make kvm-demolish
$ make kvm-install

method #2 for when you've lots of build trees and/or are in a hurry:
update by hand

$ make kvmsh-base
# dnf install libseccomp-devel
# poweroff
$ make kvm-uninstall
$ make kvm-install