TrkVertexSeedFinderTools: cmake fixes

Declare an interface library for exported heades.

Library dependency fixes.

This merge request affects 1 package:

• Tracking/TrkVertexFitter/TrkVertexSeedFinderTools

Adding @amorley as watcher

added Tracking master review-pending-level-1 labels

CI Result SUCCESS (hash b9dd6b33)

	Athena	AthSimulation	AnalysisBase	AthGeneration
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 7
AthSimulation: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 16661]

Clear, approving.

Pavol [as L2 MR shifter]

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

mentioned in commit 59a01ca3

merged

added sweep:ignore label