vtk: Use external viskores

graphics/vtk/Portfile

@@ -28,7 +28,7 @@ compiler.blacklist-append {clang < 1100}
 
 github.setup        Kitware vtk 9.6.1 v
 github.tarball_from archive
-revision            0
+revision            1
 categories          graphics devel
 license             BSD
 
@@ -54,14 +54,16 @@ depends_lib-append  path:share/pkgconfig/eigen3.pc:eigen3 \
                     port:hdf5 \
                     port:libxml2 \
                     port:${proj_version} \
-                    port:tiff
+                    port:tiff \
+                    port:viskores
 
 configure.args-append \
                     -DVTK_MODULE_USE_EXTERNAL_VTK_eigen:BOOL=ON \
                     -DVTK_MODULE_USE_EXTERNAL_VTK_hdf5:BOOL=ON \
                     -DVTK_MODULE_USE_EXTERNAL_VTK_libproj:BOOL=ON \
                     -DVTK_MODULE_USE_EXTERNAL_VTK_libxml2:BOOL=ON \
-                    -DVTK_MODULE_USE_EXTERNAL_VTK_tiff:BOOL=ON
+                    -DVTK_MODULE_USE_EXTERNAL_VTK_tiff:BOOL=ON \
+                    -DVTK_MODULE_USE_EXTERNAL_VTK_vtkviskores:BOOL=ON
 
 mpi.enforce_variant hdf5