SPI-2713 dev4lhcb with LHCB_8 generators

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cmake/toolchain/heptools-dev4lhcb.cmake

@@ -34,10 +34,10 @@ LCG_user_recipe(
 
 # generator versions from LHCB_8
 LCG_external_package(lhapdf            6.2.3p1              ${MCGENPATH}/lhapdf author=6.2.3 usecxxstd=1 )
-LCG_external_package(photos++          3.56.lhcb1           ${MCGENPATH}/photos++ author=3.56 hepmc=2 )
+LCG_external_package(photos++          3.56.lhcb1           ${MCGENPATH}/photos++ author=3.56 hepmc=${LHCB_HEPMC} )
 LCG_external_package(pythia6           427.2.lhcb           ${MCGENPATH}/pythia6 author=6.4.27 hepevt=200000 )
-LCG_external_package(tauola++          1.1.6b.lhcb          ${MCGENPATH}/tauola++ author=1.1.6b hepmc=2)
-LCG_external_package(crmc              1.8.0.lhcb           ${MCGENPATH}/crmc author=1.8.0 hepmc=2)
+LCG_external_package(tauola++          1.1.6b.lhcb          ${MCGENPATH}/tauola++ author=1.1.6b hepmc=${LHCB_HEPMC})
+LCG_external_package(crmc              1.8.0.lhcb           ${MCGENPATH}/crmc author=1.8.0 hepmc=${LHCB_HEPMC})
 LCG_external_package(starlight         r313                 ${MCGENPATH}/starlight )
 LCG_external_package(madgraph5amc      2.9.3.atlas1         ${MCGENPATH}/madgraph5amc author=2.9.3)
 LCG_external_package(pythia8           244.lhcb4            ${MCGENPATH}/pythia8 author=244 )