PKG: ENH: hack ITK's cmake files after installation

SuperBuild/CMake/post_install.cmake

+set(file_list)
+file(GLOB file_list "${PATCH_DIR}/*.cmake")
+foreach(cmake_file ${file_list})
+  file(STRINGS "${cmake_file}" MATCH_FOUND REGEX "${MATCH}")
+  if(MATCH_FOUND)
+    file(STRINGS "${cmake_file}" cmake_file_CONTENTS NEWLINE_CONSUME)
+    set(CODE_SNIPPET "get_filename_component(DEPS_INSTALL_DIR \"$${}{CMAKE_CURRENT_LIST_FILE}\" PATH)")
+    if (PATH_STRIP_COUNT LESS 1)
+      set(PATH_STRIP_COUNT 2)
+    endif()
+    foreach(loop_var RANGE 1 ${PATH_STRIP_COUNT})
+      set(CODE_SNIPPET "${CODE_SNIPPET} \nget_filename_component(DEPS_INSTALL_DIR \"$${}{DEPS_INSTALL_DIR}\" PATH)" )
+    endforeach()
+    string(REPLACE "${MATCH}" "$${}{DEPS_INSTALL_DIR}" cmake_file_CONTENTS_NEW ${cmake_file_CONTENTS})
+    file(WRITE "${cmake_file}" 
+      "# This file is modified by OTB after installation.\n"
+      "# For example, see POST_INSTALL_* step in OTB/SuperBuild/CMake/External_itk.cmake \n"
+      "# BEGIN CODE BLOCK FROM OTB SUPERBUILD\n"
+      "${CODE_SNIPPET}\n"
+      "# END CODE BLOCK FROM OTB SUPERBUILD\n"
+      "${cmake_file_CONTENTS_NEW}\n")
+  endif()
+endforeach() #foreach(cmake_file