vtk-config: clarify VTK_PREFIX_PATH

Nothing added other prefixes and the helpers now make the extra logic
unnecessary.

CMake/vtk-config.cmake.in

@@ -11,8 +11,7 @@ The following variables are provided by this module:
   * `VTK_MINOR_VERSION`: The minor version of VTK found.
   * `VTK_BUILD_VERSION`: The build version of VTK found.
   * `VTK_AVAILABLE_COMPONENTS`: Components available with VTK.
-  * `VTK_PREFIX_PATH`: Install prefixes for VTK. May include additional paths
-    for other prefixes.
+  * `VTK_PREFIX_PATH`: Install prefix for VTK.
   * `VTK_LEGACY_REMOVE`: Whether VTK's deprecated APIs are
     compiled out or not.
   * `VTK_HAS_VTKm`: If VTK provides VTK-m.
@@ -98,8 +97,6 @@ include("${CMAKE_CURRENT_LIST_DIR}/vtk-prefix.cmake")
 set("${CMAKE_FIND_PACKAGE_NAME}_PREFIX_PATH"
   "${_vtk_module_import_prefix}")
 unset(_vtk_module_import_prefix)
-list(APPEND "${CMAKE_FIND_PACKAGE_NAME}_PREFIX_PATH"
-  @vtk_prefix_paths@)
 list(INSERT CMAKE_PREFIX_PATH 0
   ${${CMAKE_FIND_PACKAGE_NAME}_PREFIX_PATH})
 

CMake/vtkInstallCMakePackage.cmake

@@ -21,8 +21,6 @@ endif ()
 
 _vtk_module_write_import_prefix("${vtk_cmake_build_dir}/vtk-prefix.cmake" "${vtk_cmake_destination}")
 
-set(vtk_prefix_paths)
-
 set(vtk_python_version "")
 if (VTK_WRAP_PYTHON)
   set(vtk_python_version "${VTK_PYTHON_VERSION}")
@@ -33,14 +31,6 @@ configure_file(
   "${vtk_cmake_build_dir}/vtk-config.cmake"
   @ONLY)
 
-if (NOT DEFINED VTK_RELOCATABLE_INSTALL)
-  option(VTK_RELOCATABLE_INSTALL "Do not embed hard-coded paths into the install" ON)
-  mark_as_advanced(VTK_RELOCATABLE_INSTALL)
-endif ()
-if (VTK_RELOCATABLE_INSTALL)
-  set(vtk_prefix_paths)
-endif ()
-
 configure_file(
   "${vtk_cmake_dir}/vtk-config.cmake.in"
   "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/vtk-config.cmake"
@@ -140,6 +130,11 @@ foreach (vtk_cmake_module_file IN LISTS vtk_cmake_module_files vtk_cmake_patch_f
 endforeach ()
 
 include(vtkInstallCMakePackageHelpers)
+
+if (NOT DEFINED VTK_RELOCATABLE_INSTALL)
+  option(VTK_RELOCATABLE_INSTALL "Do not embed hard-coded paths into the install" ON)
+  mark_as_advanced(VTK_RELOCATABLE_INSTALL)
+endif ()
 if (NOT VTK_RELOCATABLE_INSTALL)
   list(APPEND vtk_cmake_files_to_install
     "${vtk_cmake_build_dir}/vtk-find-package-helpers.cmake")