GitLab

gnus-util.el (gnus-completing-read-function): Exclude gnus-icompleting-read and gnus-ido-completing-read from candidates for XEmacs since iswitchb.el is very old and ido.el is unavailable in XEmacs.
gnus-registry.el (gnus-registry-install-nnregistry): Rewrite so as not to use `delete-dups' that is unavailable in XEmacs 21.4.