Until now HepMCAnalysis assumed that it would always be built
against FastJet coming from the same project. But now that
AthGeneration wants to pick up FastJet/FJContrib from LCG,
this external must also be built against that.

Conflicts:
	External/HepMCAnalysis/CMakeLists.txt
	Projects/AthAnalysisExternals/CMakeLists.txt
	Projects/AthDerivationExternals/CMakeLists.txt
	Projects/AthGenerationExternals/CMakeLists.txt
	Projects/AthSimulationExternals/CMakeLists.txt
	Projects/AthenaExternals/CMakeLists.txt