COMP: Ensure teem is properly link against png if CMake > 2.8.11.2 is used

See inlined comment for more details.

Associated discussion: http://massmail.spl.harvard.edu/public-archives/slicer-devel/2013/thread.html#13536

Fixes #3369

Co-authored-by: Steve Pieper <pieper@bwh.harvard.edu>
Co-authored-by: James Cook <james.j.cook@duke.edu>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22411 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Do not build DWIConvert module if DICOM support is disabled

"DWIConvert.cxx" expects "itkDCMTKFileReader.h" header.
See https://github.com/BRAINSia/BRAINSTools/blob/ddf903b56fd6633945e1927b54393f7c65268dea/DWIConvert/DWIConvert.cxx#L47

Fixes #3370

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22412 3bd1e089-480b-0410-8dfb-8563597acbee