bug#12135: 24.1.50; compatibility between compiled files in emacs-24.1 and 24.2

[Stefan Monnier]

> Now quit Emacs-24.2 and switch to Emacs-24.1.
> Start from 5) and repeat 6) and 7)
> You have no completion on helm commands.

Ah, you mean that the flet byte-compiled with Emacs-24.2 won't run under
Emacs-24.1.  That's true.  I have not tried to preserve such
compatibility in my changes to CL.

> Quit Emacs-24.1 and run make again to recompile helm files.
> Start again from 5) and repeat 6) and 7)
> Ok good you have completion on all helm commands.

Yes, and these files should work correctly under Emacs-24.2 (at least
I did try to preserve this compatibility).


        Stefan