message: Fix for handling of OSL legacy closures
  Fix to rename osl legacy impl file if using legacy closures for build area. Otherwise non-legacy file will be used and
  osl compile and render tests will fail.
diff: @@ -84,6 +84,11 @@ endif()
  add_custom_command(TARGET MaterialXTest POST_BUILD
  COMMAND ${CMAKE_COMMAND} -E copy_directory
  ${CMAKE_CURRENT_SOURCE_DIR}/../../libraries ${CMAKE_BINARY_DIR}/bin/libraries)
  +if(MATERIALX_OSL_LEGACY_CLOSURES)
  + add_custom_command(TARGET MaterialXTest POST_BUILD
  + COMMAND ${CMAKE_COMMAND} -E rename
  + ${CMAKE_BINARY_DIR}/bin/libraries/pbrlib/genosl/pbrlib_genosl_impl.legacy ${CMAKE_BINARY_DIR}/bin/libraries/pbrlib/genosl/pbrlib_genosl_impl.mtlx)
  +endif()
  if(MATERIALX_BUILD_GEN_MDL)
  install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/../../source/MaterialXGenMdl/mdl/"
  