* helm-elisp.el (helm-set-variable): No need to be interactive.
* helm-elisp.el (helm-lisp-completion-predicate-at-point): New. Borrowed from `lisp-completion-at-point' version of emacs-24.3.
(helm-lisp-completion-at-point): Use it to calculate predicate that is no more
calculated in emacs-24.3.50.1.