COMP: Ensure DCMTK libraries can be found on system without setting DCMTK_DIR
COMP: Ensure DCMTK libraries can be found on system without setting DCMTK_DIR

See inlined comment for more details.

Change-Id: Id6efee7eee301b73cbeec59f9739fb9f6450baf5

jmerkow/ITK,ajjl/ITK,msmolens/ITK,LucasGandel/ITK,jmerkow/ITK,heimdali/ITK,hjmjohnson/ITK,jcfr/ITK,fbudin69500/ITK,Kitware/ITK,BlueBrain/ITK,stnava/ITK,eile/ITK,fbudin69500/ITK,BRAINSia/ITK,PlutoniumHeart/ITK,fbudin69500/ITK,vfonov/ITK,malaterre/ITK,vfonov/ITK,Kitware/ITK,jmerkow/ITK,hendradarwin/ITK,biotrump/ITK,biotrump/ITK,vfonov/ITK,thewtex/ITK,atsnyder/ITK,eile/ITK,malaterre/ITK,BlueBrain/ITK,spinicist/ITK,atsnyder/ITK,Kitware/ITK,BRAINSia/ITK,msmolens/ITK,Kitware/ITK,jmerkow/ITK,LucHermitte/ITK,hendradarwin/ITK,hendradarwin/ITK,fedral/ITK,fedral/ITK,InsightSoftwareConsortium/ITK,ajjl/ITK,blowekamp/ITK,LucHermitte/ITK,thewtex/ITK,BlueBrain/ITK,BlueBrain/ITK,eile/ITK,stnava/ITK,fedral/ITK,jcfr/ITK,stnava/ITK,ajjl/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,spinicist/ITK,atsnyder/ITK,jcfr/ITK,malaterre/ITK,msmolens/ITK,msmolens/ITK,spinicist/ITK,BRAINSia/ITK,blowekamp/ITK,spinicist/ITK,hendradarwin/ITK,malaterre/ITK,msmolens/ITK,atsnyder/ITK,stnava/ITK,PlutoniumHeart/ITK,heimdali/ITK,jmerkow/ITK,biotrump/ITK,eile/ITK,fbudin69500/ITK,stnava/ITK,InsightSoftwareConsortium/ITK,zachary-williamson/ITK,thewtex/ITK,LucasGandel/ITK,richardbeare/ITK,zachary-williamson/ITK,BRAINSia/ITK,LucasGandel/ITK,vfonov/ITK,msmolens/ITK,Kitware/ITK,LucasGandel/ITK,BRAINSia/ITK,hjmjohnson/ITK,blowekamp/ITK,ajjl/ITK,spinicist/ITK,eile/ITK,jmerkow/ITK,LucHermitte/ITK,fbudin69500/ITK,heimdali/ITK,PlutoniumHeart/ITK,fedral/ITK,atsnyder/ITK,BlueBrain/ITK,jmerkow/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,spinicist/ITK,hjmjohnson/ITK,richardbeare/ITK,malaterre/ITK,eile/ITK,richardbeare/ITK,stnava/ITK,hendradarwin/ITK,jcfr/ITK,blowekamp/ITK,fbudin69500/ITK,LucHermitte/ITK,fedral/ITK,Kitware/ITK,heimdali/ITK,ajjl/ITK,eile/ITK,zachary-williamson/ITK,blowekamp/ITK,BlueBrain/ITK,biotrump/ITK,biotrump/ITK,eile/ITK,heimdali/ITK,fedral/ITK,hendradarwin/ITK,LucasGandel/ITK,fedral/ITK,malaterre/ITK,vfonov/ITK,stnava/ITK,richardbeare/ITK,LucasGandel/ITK,atsnyder/ITK,jcfr/ITK,InsightSoftwareConsortium/ITK,blowekamp/ITK,zachary-williamson/ITK,fbudin69500/ITK,blowekamp/ITK,vfonov/ITK,LucasGandel/ITK,LucHermitte/ITK,vfonov/ITK,jcfr/ITK,biotrump/ITK,BRAINSia/ITK,jcfr/ITK,PlutoniumHeart/ITK,PlutoniumHeart/ITK,LucHermitte/ITK,zachary-williamson/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,zachary-williamson/ITK,PlutoniumHeart/ITK,eile/ITK,heimdali/ITK,LucHermitte/ITK,spinicist/ITK,fedral/ITK,hendradarwin/ITK,atsnyder/ITK,spinicist/ITK,fbudin69500/ITK,msmolens/ITK,malaterre/ITK,zachary-williamson/ITK,atsnyder/ITK,hjmjohnson/ITK,PlutoniumHeart/ITK,stnava/ITK,PlutoniumHeart/ITK,vfonov/ITK,ajjl/ITK,malaterre/ITK,BlueBrain/ITK,heimdali/ITK,msmolens/ITK,hjmjohnson/ITK,blowekamp/ITK,LucasGandel/ITK,heimdali/ITK,zachary-williamson/ITK,biotrump/ITK,ajjl/ITK,hjmjohnson/ITK,richardbeare/ITK,BRAINSia/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,ajjl/ITK,thewtex/ITK,hendradarwin/ITK,LucHermitte/ITK,thewtex/ITK,BlueBrain/ITK,jmerkow/ITK,jcfr/ITK,thewtex/ITK,richardbeare/ITK,atsnyder/ITK,zachary-williamson/ITK,spinicist/ITK,biotrump/ITK,hjmjohnson/ITK,richardbeare/ITK,stnava/ITK