Update VTK external project to 5.10 head to fix clang compilation error

$ git shortlog d3b66526624ba8e55addcddb0ec28c40982473ac...v5.10.1 --no-merges
David Cole (1):
      Rendering: Use AdjustWindowRect to ensure pixel perfect client size

Goodwin Lawlor (6):
      Backport using Tcl_GetErrorLine with Tcl8.6
      Let macro find TclTk version 8.6
      Update the TclTk internal files for 8.6
      Backport using Tcl_GetErrorLine with Tcl8.6
      Let macro find TclTk version 8.6
      Update the TclTk internal files for 8.6

Hans Johnson (1):
      COMP: Fix compiler error on clang c++11

Sean McBride (5):
      Conditionalize insane "#define inline" in libtiff
      COMP: fixed compilation error using llvm's libc++
      COMP: fixed llvm libc++ build error by removing invalid 'operator<<'
      Fixed compile error with llvm libcxx
      added missing #include, fixing compiler error with llvm's libc++

CMakeExternals/VTK.cmake

@@ -25,7 +25,7 @@ endif()
 
 if(NOT DEFINED VTK_DIR AND NOT ${CMAKE_PROJECT_NAME}_USE_SYSTEM_${proj})
 
-  set(revision_tag v5.10.0)
+  set(revision_tag d3b66526624ba8e55addcddb0ec28c40982473ac)
   if(${proj}_REVISION_TAG)
     set(revision_tag ${${proj}_REVISION_TAG})
   endif()