CaloEvent: Remove use of obsolete CxxUtils headers.

Remove use of headers from CxxUtils that are no longer needed now that we're building with c++17.

This merge request affects 1 package:

• Calorimeter/CaloEvent

Adding @pavol as watcher

added Calorimeter JetEtmiss master review-pending-level-1 labels

CI Result FAILURE

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests	N/A	N/A

Full details available at NICOS MR-25072-2019-07-24-10-14
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 1408]

Jenkins please retry a build

This merge request affects 1 package:

• Calorimeter/CaloEvent

Adding @pavol as watcher

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-25072-2019-07-24-15-29
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 1414]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit d27e746b

added sweep:ignore label