* lisp/international/mule-cmds.el (ucs-names): Skip adding an old-name
if it conflicts with the offical name of a codepoint. Adjust the
ranges iterated over to account for new Unicode codepoints.
* test/lisp/international/mule-tests.el
(mule-cmds-tests--ucs-names-old-name-override,
mule-cmds-tests--ucs-names-missing-names): New tests for checking
'ucs-names' consistency.
Bug#65997