There should already be a clean way in DCMTK to solve the issue without applying a Debian-specific patch:
DCMTK offers the CMake option "BUILD_APPS" which is (obviously) enabled per default. If you disable it, applications (like dcmdump) are not built and also the related export file (DCMTKTargets*.cmake) will not list them any more. Best regards, Michael Onken -- http://www.open-connections.de