Bring in EIEIO from Emacs.
* auth-source.el: Load EIEIO from "gnus-fallback-lib/eieio" if
necessary.
* gnus-fallback-lib/eieio/eieio-base.el: Copy from Emacs.
* gnus-fallback-lib/eieio/eieio-comp.el: Copy from Emacs.
* gnus-fallback-lib/eieio/eieio-custom.el: Copy from Emacs.
* gnus-fallback-lib/eieio/eieio-datadebug.el: Copy from Emacs.
* gnus-fallback-lib/eieio/eieio-opt.el: Copy from Emacs.
* gnus-fallback-lib/eieio/eieio-speedbar.el: Copy from Emacs.
* gnus-fallback-lib/eieio/eieio.el: Copy from Emacs.
- [D] lisp/gnus-fallback-lib/eieio/eieio-opt.el