eieio: Move to obsolete and use the one that ships with Emacs

eieio: Move to obsolete and use the one that ships with Emacs

* lisp/eieio: Move to obsolete.

* etc/fallback-libraries: Add eieio fallback libraries.

* Makefile (top-level): Remove eieio compilation and add compilation of
  fallback eieio for Emacs 24.1 and 24.2. Throw error for Emacs 23.x.

* cedet-devel-load.el: Always require eieio at the top.  Load
  cedet-compat earlier.  Remove advices for eieio helpers.

* cedet-remove-builtin.el: eieio must not be removed anymore.

* semantic/ede-grammar.el (semantic-ede-proj-target-grammar): Remove
  cedet-compat from aux-packages initform, as it will be loaded by
  cedet-devel-load anyway.
  (ede-proj-makefile-insert-variables): Remove eieio from load-path.

* lisp/cedet/cedet-compat.el: Load fallback eieio for Emacs 24.1 and
  24.2.  Add new aliases for Emacs 24.3.

* Project.ede, Makefiles: Remove eieio and regenerate.

* tests: Remove eieio tests.