* lisp/emacs-lisp/package.el: Reduce macrology in ...with-response-buffer
(package--with-response-buffer-1): New function, extracted from package--with-response-buffer. (package--with-response-buffer): Use it.
(package--with-response-buffer-1): New function, extracted from package--with-response-buffer. (package--with-response-buffer): Use it.