[Rivet] Rivet 2.6.0 failing with clang6

[Ivan Razumov]

Dear Rivet developers,

Rivet 2.6.0 is failing to build with clang 6 with the following error:

  error: delete called on non-final 'Rivet::HasPID' that has virtual functions but non-virtual destructor

Please see this build log for details: 
http://cdash.cern.ch/upload/2a6dd5ec142ab3fbaab6c66975d171fa02c8ac97/rivet-2.6.0-build.log

Thanks,
Ivan for the GENSER team

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