Add update file for VTK-c

.gitattributes

@@ -17,3 +17,4 @@ data/** filter=lfs diff=lfs merge=lfs -text
 vtkm/thirdparty/diy/vtkmdiy/**           -format.clang-format -whitespace
 vtkm/thirdparty/optionparser/vtkmoptionparser/** -format.clang-format -whitespace
 vtkm/thirdparty/lodepng/vtkmlodepng/** -format.clang-format -whitespace
+vtkm/thirdparty/vtkc/vtkmvtkc/**  -format.clang-format -whitespace

vtkm/thirdparty/vtkc/update.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+shopt -s dotglob
+
+readonly name="vtkc"
+readonly ownership="VTK-c Upstream <kwrobot@kitware.com>"
+readonly subtree="vtkm/thirdparty/$name/vtkm$name"
+readonly repo="https://gitlab.kitware.com/sujin.philip/vtk-c.git"
+readonly tag="master"
+readonly paths="
+vtkc
+LICENSE.md
+README.md
+"
+
+extract_source () {
+    git_archive
+    pushd "${extractdir}/${name}-reduced"
+    rm -rf vtkc/testing
+    popd
+}
+
+. "${BASH_SOURCE%/*}/../update-common.sh"