Merge remote-tracking branch 'gl/dgobbi/tcl-config' into HEAD

* gl/dgobbi/tcl-config:
  Do not set TK_INTERNAL_PATH unless Win32, APPLE
  Remove obsolete VTK_USE_TK setting

Filters/Sources/Testing/Python/CMakeLists.txt

@@ -11,7 +11,7 @@ vtk_add_test_python(
   TestGlyphScaling.py
   TestEllipseArcSourceResolution.py
   )
-if(VTK_USE_TK AND Module_vtkRenderingTk)
+if(Module_vtkRenderingTk)
   vtk_add_test_python(
     squadViewer.py,NO_RT
     )

Rendering/Tk/CMakeLists.txt

@@ -2,7 +2,7 @@ vtk_module_export_info()
 
 find_package(TCL)
 
-if(TK_FOUND AND VTK_USE_TK)
+if(TK_FOUND)
 
   set(HAVE_LIMITS_H ${CMAKE_HAVE_LIMITS_H})
   set(HAVE_UNISTD_H ${CMAKE_HAVE_UNISTD_H})
@@ -18,7 +18,7 @@ if(TK_FOUND AND VTK_USE_TK)
   endif()
 
   # Need Tk internal headers for Tk initialization.
-  set(try_file "tkInt.h")
+  set(try_file)
   set(try_paths)
   if(WIN32)
     set(try_file "tkWinPort.h")