added options for pointing to the dll config headers for png and zlib built by vtk
added options for pointing to the dll config headers for png and zlib built by vtk


git-svn-id: 9e9401559e51101c165cdce4d49b411eb20436ed@3368 3d70eeeb-363e-0410-a505-8a46323a89f2

Slicer/teem,Slicer/teem,Slicer/teem,BRAINSia/teem,Slicer/teem,Slicer/teem,BRAINSia/teem,BRAINSia/teem,BRAINSia/teem,BRAINSia/teem