SCRAMV1: Update to V2_2_5_pre2 version

Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>
pythia8: update version to 175.

Bumping version to 175
Request: https://hypernews.cern.ch/HyperNews/CMS/get/ext-pkg-mgmt/353.html

Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>
herwig: update version to 6.521; drop %ifos macro

Updates version to 6.521 and drops %ifos macro from SPEC.
Request: https://twiki.cern.ch/twiki/bin/viewauth/CMS/OfflineComputingPlanningMeeting20130426

Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>