PoolSvc: Thread-safety checker adjustment.

The ATLAS_CHECK_THREAD_SAFETY flag file is better placed in the include directory than in the package root directory.

This merge request affects 1 package:

• Database/AthenaPOOL/PoolSvc

This merge request affects 2 files:

• Database/AthenaPOOL/PoolSvc/ATLAS_CHECK_THREAD_SAFETY
• Database/AthenaPOOL/PoolSvc/PoolSvc/ATLAS_CHECK_THREAD_SAFETY

Adding @mnowak ,@ssnyder as watchers

added Database master review-pending-level-1 labels

CI Result FAILURE (hash e91adc25)

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

Full details available on this CI monitor view
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 41104]

Ci failure unrelated. Approving -- L1

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

merged

mentioned in commit cbc54bcf

added sweep:ignore label