Fix warning about unused cpp file
When using LHCb!3334 (merged) we get a warning about a cpp file not used in Rec: Rec/ChargedProtoANNPID/src/ChargedProtoANNPIDCommonBase.cpp
This is not strictly true, but this MR fixes the warning nonetheless.
When using LHCb!3334 (merged) we get a warning about a cpp file not used in Rec: Rec/ChargedProtoANNPID/src/ChargedProtoANNPIDCommonBase.cpp
This is not strictly true, but this MR fixes the warning nonetheless.