Bug#931169: hfst: add Breaks: libhfst45-dev for smoother upgrades from stretch

[Andreas Beckmann]

Followup-For: Bug #931169
Control: tag -1 pending

Hi,

I just uploaded my patch as a NMU to DELAYED/10.
I'm planning to rebuild that package for buster to get the upgrade
problem fixed there in the next point release.

Andreas