subr.el (apply-partially): Use lexical binding.

Fixes: debbugs:19785

See
<URL:http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg00784.html>
for discussion.

lisp/ChangeLog

@@ -1,3 +1,7 @@
+2015-02-08  David Kastrup  <dak@gnu.org>
+
+	* subr.el (apply-partially): Use lexical binding here.
+
 2015-02-08  Artur Malabarba  <bruce.connor.am@gmail.com>
 
 	* newcomment.el (comment-line): New command.

lisp/subr.el

@@ -136,8 +136,8 @@ ARGS is a list of the first N arguments to pass to FUN.
 The result is a new function which does the same as FUN, except that
 the first N arguments are fixed at the values with which this function
 was called."
-  `(closure (t) (&rest args)
-            (apply ',fun ,@(mapcar (lambda (arg) `',arg) args) args)))
+  (lambda (&rest args2)
+    (apply fun (append args args2))))
 
 (defmacro push (newelt place)
   "Add NEWELT to the list stored in the generalized variable PLACE.