time_t ABI transition

Lukas Märdianrequested to merge
slyon/fwknop:time_t into master

As generated by the time-t-me script: https://salsa.debian.org/vorlon/armhf-time_t/

Also accounting for additional t64 Breaks/Replaces (Closes #1062046).

see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1061958

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