Fix duplicate entries in cedet's loaddefs.el files.

Fix duplicate entries in cedet's loaddefs.el files.
* emacs-lisp/autoload.el (autoload-file-load-name): Be more clever.
Should make most file-local generated-autoload-file unnecessary.
(print-readably): Silence warnings.
(autoload-find-destination): Take load-name as an arg to make sure
it's the same as the one that will be in the file.
(autoload-generate-file-autoloads): Adjust to above changes.
Try to make the dataflow a bit simpler.