COMP: Update FindDCMTK to not look in default path.
COMP: Update FindDCMTK to not look in default path.

When DCMTK was installed on the system, FindDCMTK was using
these system libs instead of the one available under DCMTK_DIR

laurennlam/CTK,CJGoch/CTK,AndreasFetzer/CTK,jcfr/CTK,commontk/CTK,fedorov/CTK,pieper/CTK,rkhlebnikov/CTK,lassoan/CTK,SINTEFMedtek/CTK,CJGoch/CTK,AndreasFetzer/CTK,rkhlebnikov/CTK,sankhesh/CTK,AndreasFetzer/CTK,Heather/CTK,fedorov/CTK,lassoan/CTK,151706061/CTK,jcfr/CTK,jcfr/CTK,finetjul/CTK,msmolens/CTK,naucoin/CTK,finetjul/CTK,Sardge/CTK,SINTEFMedtek/CTK,SINTEFMedtek/CTK,151706061/CTK,jcfr/CTK,Sardge/CTK,vovythevov/CTK,ddao/CTK,rkhlebnikov/CTK,pieper/CTK,mehrtash/CTK,pieper/CTK,finetjul/CTK,espakm/CTK,commontk/CTK,vovythevov/CTK,lassoan/CTK,finetjul/CTK,ddao/CTK,sankhesh/CTK,danielknorr/CTK,commontk/CTK,danielknorr/CTK,AndreasFetzer/CTK,151706061/CTK,vovythevov/CTK,danielknorr/CTK,Heather/CTK,vovythevov/CTK,naucoin/CTK,espakm/CTK,rkhlebnikov/CTK,sankhesh/CTK,Heather/CTK,msmolens/CTK,fedorov/CTK,jcfr/CTK,mehrtash/CTK,Sardge/CTK,Heather/CTK,naucoin/CTK,laurennlam/CTK,ddao/CTK,danielknorr/CTK,espakm/CTK,151706061/CTK,CJGoch/CTK,CJGoch/CTK,Sardge/CTK,mehrtash/CTK,msmolens/CTK,SINTEFMedtek/CTK,CJGoch/CTK,msmolens/CTK,fedorov/CTK,espakm/CTK,151706061/CTK,sankhesh/CTK,ddao/CTK,SINTEFMedtek/CTK,mehrtash/CTK,pieper/CTK,laurennlam/CTK,naucoin/CTK,commontk/CTK,lassoan/CTK,laurennlam/CTK