LArTrackingGeometry: cmake cleanup

- remove `atlas_depends_on_subdirs`
- do not install component headers
- update link dependencies
- enable flake8

LArCalorimeter/LArTrackingGeometry/CMakeLists.txt

-################################################################################
-# Package: LArTrackingGeometry
-################################################################################
+# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( LArTrackingGeometry )
 
-# Declare the package's dependencies:
-atlas_depends_on_subdirs( PUBLIC
-                          Calorimeter/CaloTrackingGeometry
-                          Control/AthenaBaseComps
-                          GaudiKernel
-                          Tracking/TrkDetDescr/TrkDetDescrInterfaces
-                          PRIVATE
-                          Calorimeter/CaloDetDescr
-                          Control/StoreGate
-                          DetectorDescription/GeoModel/GeoModelUtilities
-                          LArCalorimeter/LArGeoModel/LArReadoutGeometry
-                          Tracking/TrkDetDescr/TrkDetDescrGeoModelCnv
-                          Tracking/TrkDetDescr/TrkDetDescrUtils
-                          Tracking/TrkDetDescr/TrkGeometry
-                          Tracking/TrkDetDescr/TrkGeometrySurfaces
-                          Tracking/TrkDetDescr/TrkSurfaces
-                          Tracking/TrkDetDescr/TrkVolumes )
-
 # External dependencies:
-find_package( Eigen )
 find_package( GeoModelCore )
 
 # Component(s) in the package:
 atlas_add_component( LArTrackingGeometry
                      src/*.cxx
                      src/components/*.cxx
-                     INCLUDE_DIRS ${EIGEN_INCLUDE_DIRS} ${GEOMODELCORE_INCLUDE_DIRS}
-                     LINK_LIBRARIES ${EIGEN_LIBRARIES} ${GEOMODELCORE_LIBRARIES} AthenaBaseComps GaudiKernel TrkDetDescrInterfaces CaloDetDescrLib StoreGateLib SGtests GeoModelUtilities LArReadoutGeometry TrkDetDescrGeoModelCnv TrkDetDescrUtils TrkGeometry TrkGeometrySurfaces TrkSurfaces TrkVolumes CaloTrackingGeometryLib )
+                     INCLUDE_DIRS ${GEOMODELCORE_INCLUDE_DIRS}
+                     LINK_LIBRARIES ${GEOMODELCORE_LIBRARIES} AthenaBaseComps GaudiKernel TrkDetDescrInterfaces CaloDetDescrLib GeoModelUtilities LArReadoutGeometry TrkDetDescrGeoModelCnv TrkDetDescrUtils TrkGeometry TrkGeometrySurfaces TrkSurfaces TrkVolumes CaloTrackingGeometryLib )
 
 # Install files from the package:
-atlas_install_headers( LArTrackingGeometry )
-atlas_install_python_modules( python/*.py )
-
+atlas_install_python_modules( python/*.py POST_BUILD_CMD ${ATLAS_FLAKE8} )