AthenaPoolTestAthenaPool: cmake cleanup

- remove ROOT dependency
- remove atlas_depends_on_subdirs
- update link dependencies

AtlasTest/DatabaseTest/AthenaPoolTestAthenaPool/CMakeLists.txt

-################################################################################
-# Package: AthenaPoolTestAthenaPool
-################################################################################
+# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( AthenaPoolTestAthenaPool )
 
-# Declare the package's dependencies:
-atlas_depends_on_subdirs( PUBLIC
-                          Control/DataModelAthenaPool
-                          PRIVATE
-                          AtlasTest/DatabaseTest/AthenaPoolTestData
-                          Database/AthenaPOOL/AthenaPoolCnvSvc
-                          Database/AthenaPOOL/AthenaPoolUtilities
-                          Database/AtlasSealCLHEP )
-
-# External dependencies:
-find_package( ROOT COMPONENTS Core Tree MathCore Hist RIO pthread )
-
 # Component(s) in the package:
 atlas_add_poolcnv_library( AthenaPoolTestAthenaPoolPoolCnv
                            src/*.cxx
                            FILES AthenaPoolTestData/IAthenaPoolTestCollection.h AthenaPoolTestData/AthenaPoolTestMatrix.h AthenaPoolTestData/AthenaPoolTestMap.h AthenaPoolTestData/FauxTriggerMap.h AthenaPoolTestData/dummy_A.h AthenaPoolTestData/dummy_E.h AthenaPoolTestData/TrigPath.h AthenaPoolTestData/TestGaudiProperty.h AthenaPoolTestData/PixelRDOElemLinkVec.h
-                           INCLUDE_DIRS ${ROOT_INCLUDE_DIRS}
-                           LINK_LIBRARIES ${ROOT_LIBRARIES} DataModelAthenaPoolLib AthenaPoolTestData AthenaPoolCnvSvcLib AthenaPoolUtilities AtlasSealCLHEP )
+                           LINK_LIBRARIES AthenaPoolCnvSvcLib AthenaPoolTestData DataModelAthenaPoolLib )
 
 atlas_add_dictionary( AthenaPoolTestAthenaPoolCnvDict
                       AthenaPoolTestAthenaPool/AthenaPoolTestAthenaPoolDict.h
                       AthenaPoolTestAthenaPool/selection.xml
-                      INCLUDE_DIRS ${ROOT_INCLUDE_DIRS}
-                      LINK_LIBRARIES ${ROOT_LIBRARIES} DataModelAthenaPoolLib AthenaPoolTestData AthenaPoolCnvSvcLib AthenaPoolUtilities AtlasSealCLHEP )
-
-# Install files from the package:
-atlas_install_headers( AthenaPoolTestAthenaPool )
-
+                      LINK_LIBRARIES DataModelAthenaPoolLib AthenaPoolTestData AthenaPoolCnvSvcLib AthenaPoolUtilities )