bug#22054: Potential errors in package--builtins

[Jonas Bernoulli]

* `ielm' is missing from the list.  I suspect it is not detected as a
  package because the first line does not contain the summary.  Also,
  shouldn't the "interaction mode for Emacs Lisp" be located inside
  lisp/emacs-lisp/?

* `cl-preload' is listed as a separate package.  That might be
  intentional but wouldn't it make more sense to make it part of
  the `cl-lib' package?

* `eieio-compat' is listed as a separate package.  But I suspect that
  is intentional.  Not sure though.

* `sasl-scram-rfc' is listed as a separate package, but all the other
  `sasl-*' libraries are part of the `sasl' package.

This is for the `emacs-25' branch.