Revert "Revert "Add helm keymap""

This reverts commit da635be96b.

emacs.el

@@ -566,6 +566,10 @@ found, otherwise returns nil."
   (defvar amx-map)
   (define-key amx-map (kbd "C-h") (kbd "DEL")))
 
+(when (autoload-eval-lazily 'helm)
+  (defvar helm-map)
+  (define-key helm-map (kbd "C-h") (kbd "DEL")))
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; letters, font-lock mode and fonts