xAODTracking: prefix private static members with "s_"

Fix ATLAS naming convention compiler warnings. Curiously these only show up in the gcc13 build.

Relates to ATLASRECTS-7688 and cc @ssnyder.

This merge request affects 1 package:

• Event/xAOD/xAODTracking

This merge request affects 4 files:

• Event/xAOD/xAODTracking/Root/TrackBackend_v1.cxx
• Event/xAOD/xAODTracking/Root/TrackMeasurement_v1.cxx
• Event/xAOD/xAODTracking/xAODTracking/versions/TrackBackend_v1.h
• Event/xAOD/xAODTracking/xAODTracking/versions/TrackMeasurement_v1.h

Adding @toyamaza ,@tbold ,@akraszna as watchers

added EDM main review-pending-level-1 labels

CI Result SUCCESS (hash 88f79a29)

	Athena	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
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
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 74602]

Thanks Frank

Looks good, approving - L1

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

I saw these too and was also puzzled why they only appear in gcc13. Anyway, thanks for fixing them!

mentioned in commit 18c3b194

merged