ATH_FLATTEN related fixes

• use ATH_FLATTEN in one case it was not used

• ATH_FLATTEN already checks for GNU so no need to check again

• A couple of cases prb should FLATTEN also in opt builds

changed the description

This merge request affects no known files AND packages. Consult an expert!

This merge request affects 0 files:

added main no-domain review-pending-level-1 labels

added 1 commit

• 4e3269ff - ATH_FLATTEN related fixes

Compare with previous version

Build area was cleaned as per request posted in the DB. The full software build will be performed

This merge request affects 4 packages:

• DetectorDescription/GeoModel/GeoModelUtilities
• MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry
• MuonSpectrometer/MuonReconstruction/MuonSegmentMakers/MuonSegmentMakerTools/DCMathSegmentMaker
• Tracking/TrkDetDescr/TrkSurfaces

Affected files list will not be printed in this case

Adding @pscholer ,@stavrop ,@apsallid ,@rosati ,@jojungge ,@goetz ,@kluit ,@rbianchi as watchers

added Geometry MuonSpectrometer Tracking labels

removed no-domain label

CI Result SUCCESS (hash 68b78982)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
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
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-EL9 2777]

CI Result SUCCESS (hash 4e3269ff)

	Athena	AthSimulation	AthGeneration
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
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 2778]

Looks good, approving - L1

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

mentioned in commit 2f66f222

merged