bug#16222: Installing ELPA packages complains about :keywords in define-package

[Stefan Monnier]

> simpler fix for the byte compilation problem: let-bind
> emacs-lisp-file-regexp' in `package--compile' (or even changing
> byte-recompile-directory' to always skip `-pkg.el' files if the first option
> doesn't work; I haven't checked).

This fix is still needed, indeed: compiling the -pkg.el is a bug.


        Stefan