AthenaPoolTools+MuonIdHelpers: cmake fixes
Remove reference to nonexistent source file.
Remove references to undefined Boost/ROOT macros. We don't anyway have any direct dependencies on Boost or ROOT in MuonIDHelpers.
Remove reference to nonexistent source file.
Remove references to undefined Boost/ROOT macros. We don't anyway have any direct dependencies on Boost or ROOT in MuonIDHelpers.