[dsc] DSC Release 2.2.1

[Jerry Lundström]

Hey y'all,

Live from #OARC25 in Dallas, here comes some bugfixes!

    https://www.dns-oarc.net/files/dsc/dsc-2.2.1.tar.gz
    d7b27533c56a3b599ffee82eb503fd0160a9ca1e9461c9d4d75f8bbe9aa1bf12

For Debian and Ubuntu packages please visit:

    https://dev.dns-oarc.net/packages/

Two bugfixes with one being critical (caused segfault, sorry for that)
- `pcap-thread` had an issue that threads where not closed on exit
  of `pcap_thread_run()`, this only created many threads in my testing
  environment but reports came in that it segfaulted.
- When started `dsc` (not in debug mode) it will wait to align with
  the time, that did not get update with the configurable interval
  change.

Commits:

6e3654b Fix #90: Update pcap-thread to v1.1.2 to fix a segfault issue
c9350a3 Fix #92: Honor configured interval when aligning
acaf617 minor typo

Cheers,
Jerry