LaTeX2ε temporary first aid for external packages and classes during transition periods

LaTeX2ε kernel code that temporarily adjusts packages that are not yet updated and therefore fail if a new LaTeX release updates internal commands (which have been used in the external packages)

This is stored in a separate file external to the base bundle, so that it can be easily updated when fixes become available without the need to upload a full new LaTeX2ε release to CTAN.