Minor modes and file names

[steve-humphreys]

I have made a minor made for texinfo and noticed that the minor mode
does not take effect unless tho file name matches the minor mode name.

For instance, changing the name of the file to "crucible-mode-2021-01-28.el"
the minor mode fails to load.

----- crucible-mode.el -----
(define-minor-mode crucible-mode ...)
(provide 'crucible-mode)

----- gtexinfo.el -----
(add-to-list
   'load-path "~/Genadm/build/gungadin-1.0/elisp/crucible")
(require 'crucible-mode)
(add-hook 'texinfo-mode-hook 'crucible-mode)