bug#14010: 24.3; builtin libraries that should specify the package

[Jonas Bernoulli <jonas@bernoul.li>]

Jonas Bernoulli wrote:
>> The packages python, grep, cpp and compile don't appear in
>> package--builtins because the "Package" header keyword isn't defined
>> in the respective libraries.  I think it would make sense for these
>> to be treated as separate packages.

Glenn Morris wrote:
> But all four do appear in package--builtins?

  (The variable is now called package--builtin-versions.)

python does indeed appear in the value of package--builtin-versions.
Maybe that was already the case when I originally reported otherwise.
While python.el still does not define the "Package" header keyword, it
does define "Version".  And that is enough for it to be considered a
package (see autoload-generate-file-autoloads).

However grep, cpp and compile still do not appear there.