readding library in DerivationFrameworkMuons CmakeLists

Marco Vanadiarequested to merge
mvanadia/athena:master-fixDFM into master

Fixing CMakeLists file to build a linkable library for the DerivationFrameworkMuons package as needed by the MCP software https://gitlab.cern.ch/atlas-mcp/MuonPerformanceAnalysis

This MR is also removing references to CLHEP

CC @nkoehler @jojungge

Edited by Nicolas Koehler

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