Add VTK version 9.0.1

Author: dstoup

CMake/fletch-tarballs.cmake

@@ -429,10 +429,13 @@ list(APPEND fletch_external_sources CppDB)
 # VTK
 if (fletch_ENABLE_VTK OR fletch_ENABLE_ALL_PACKAGES)
   set(VTK_SELECT_VERSION 8.2 CACHE STRING "Select the version of VTK to build.")
-  set_property(CACHE VTK_SELECT_VERSION PROPERTY STRINGS 8.0 8.2)
+  set_property(CACHE VTK_SELECT_VERSION PROPERTY STRINGS 8.0 8.2 9.0)
 endif()
 
-if (VTK_SELECT_VERSION VERSION_EQUAL 8.2)
+if (VTK_SELECT_VERSION VERSION_EQUAL 9.0)
+  set(VTK_version 9.0.1)
+  set(VTK_md5 "b3ba14d616c3b23583c42cffb585deac")
+elseif (VTK_SELECT_VERSION VERSION_EQUAL 8.2)
   set(VTK_version 8.2.0)
   set(VTK_md5 "8af3307da0fc2ef8cafe4a312b821111")
 elseif (VTK_SELECT_VERSION VERSION_EQUAL 8.0)