ATEAM-801: vec.h compilation issues for gcc8

ATEAM-801: vec.h compilation issues for gcc8

This merge request affects 1 package:

• Control/CxxUtils

This merge request affects 1 file:

• Control/CxxUtils/CxxUtils/vec.h

Adding @ssnyder ,@rbianchi as watchers

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash d439bf93)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 44599]

added RC Attention Required label

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

merged

mentioned in commit 9f689070

added sweep:ignore label