Processed: rivet: Build-Depends on hepmc which is scheduled for removal

[Debian Bug Tracking System]

Processing control commands:

> block 885180 with -1
Bug #885180 [ftp.debian.org] RM: hepmc -- RoQA; unmaintained, does not build for > 2 years
885180 was blocked by: 891990
885180 was not blocking any bugs.
Added blocking bug(s) of 885180: 891991

-- 
885180: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=885180
891991: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=891991
Debian Bug Tracking System
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