bug#14633: 24.3.50; Dependency resolution of builtin packages broken

[Sebastian Wiesner]

Installing a package which depends on the builtin eieio package in
version 1.3 fails with an error stating that "Package `eieio-1.3' is
unavailable":

ELISP> (package-installed-p 'eieio)
t
ELISP> (package-built-in-p 'eieio)
t
ELISP> (package-install (cdr (assq 'gist package-archive-contents)))
*** Eval error ***  Package `eieio-1.3' is unavailable

The "gist" package [1] is from MELPA [2].

[1]: https://github.com/defunkt/gist.el/blob/master/gist.el
[2]: http://melpa.milkbox.net/