* lisp/emacs-lisp/cl-generic.el: Use FCR for `cl-next-method-p`

* lisp/emacs-lisp/cl-generic.el: Use FCR for `cl-next-method-p`

* lisp/emacs-lisp/fcr.el (fcr--define): Avoid `cl-lib` at run-time.
(fcr--type-sym): Delete variable.  Use an interned symbol instead,
so the closures stand a chance of being printable readably.
(fcr--fix-type, fcr--copy, fcr-get, fcr-type): Adjust accordingly.

* lisp/emacs-lisp/cl-generic.el (cl--generic-nnm): New FCR type.
(cl--generic-no-next-method-function): Delete function.
(cl-generic-call-method): Use it for the default no-next-method case.
(cl--generic-nnm-sample, cl--generic-cnm-sample): Delete vars.
(cl--generic-isnot-nnm-p): Use `fcr-type`.