Revisions of pythia

Yuchen Lin's avatar Yuchen Lin (maxlin_factory) accepted request 886022 from Bernhard Wiedemann's avatar Bernhard Wiedemann (bmwiedemann) (revision 2)
- Fix build for Leap 15.3

- Compile with %optflags

- Add reproducible.patch to drop build date (boo#1047218)

- Update to version 8.245:
  * Significant speedup of parton distribution handling.
  * Several fixes to avoid out-of-bound evaluation of vectors in
    the merging code.
  * Several fixes to correctly handle CKKW-L merging of EWkino-
    and higgsino-processes have been included.
  * Include the functionality for MC@NLO-Delta matching with
    aMC@NLO.
  * Further bug fixes for the hard process name handling for
    weak-boson-fusion-like processes, that led to an incorrect
    counting of additional emissions.
  * Small fixes to history construction in the presence of
    multiple resonances.
  * The primordial kT for LHE files is now set by the
    BeamRemnants:primordialKThard average value, rather than the
    LHE scale, since the latter may be quite low e.g. in the
    POWHEG approach.
  * The problem of "dangling" gluons causing changing color flows
    in SimpleTimeShower for top decays is now fixed.
  * Extra check added to SimpleSpaceShower for the case where a
    small daughter PDF value can lead to an infinite loop if PDF
    variations are switched on.
  * Bug fixed in the new possibility to let particles with narrow
    widths (such as onia states) obtain a simple Breit-Wigner
Wolfgang Engel's avatar Wolfgang Engel (bigironman) committed (revision 1)
osc copypac from project:openSUSE:Leap:15.2 package:pythia revision:13, using expand
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