message: Use relative paths in cmake
diff: @@ -54,10 +54,10 @@ target_link_libraries(
  add_custom_command(TARGET MaterialXView POST_BUILD
  COMMAND ${CMAKE_COMMAND} -E copy_directory
  - ${CMAKE_SOURCE_DIR}/libraries ${CMAKE_CURRENT_BINARY_DIR}/libraries)
  + ${CMAKE_CURRENT_SOURCE_DIR}/../../libraries ${CMAKE_CURRENT_BINARY_DIR}/libraries)
  add_custom_command(TARGET MaterialXView POST_BUILD
  COMMAND ${CMAKE_COMMAND} -E copy_directory
  - ${CMAKE_SOURCE_DIR}/resources ${CMAKE_CURRENT_BINARY_DIR}/resources)
  + ${CMAKE_CURRENT_SOURCE_DIR}/../../resources ${CMAKE_CURRENT_BINARY_DIR}/resources)
  if(MATERIALX_BUILD_OIIO AND OPENIMAGEIO_ROOT_DIR)
  add_custom_command(TARGET MaterialXView POST_BUILD
  COMMAND ${CMAKE_COMMAND} -E copy_directory
  