Emacs: Only call package-initialize in Emacs < 27 and some cleanup.

<http://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS.27>

init/basics/package-management.el

@@ -1,6 +1,6 @@
 ;;; package-management.el --- Initialize package management.  -*- lexical-binding: t; -*-
 
-;; Time-stamp: <2019-12-04T06:07:31+00:00>
+;; Time-stamp: <2019-12-26T06:00:54+00:00>
 
 ;;; Commentary:
 ;; * Sets up package sources and their priorities.
@@ -24,7 +24,8 @@
 ;; Workaround for 26.2 <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341>.
 (defvar gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3")
 
-(package-initialize)
+(when (< emacs-major-version 27)
+  (package-initialize))
 
 ;; Add path for custom packages.
 (add-to-list 'load-path "~/.emacs.d/custom-packages/")
@@ -38,14 +39,19 @@
   (require 'use-package))
 
 ;; Always install packages if they are not present.
-(require 'use-package-ensure)
-(setq use-package-always-ensure t)
+(use-package use-package-ensure
+  :ensure nil
 
-;; autocompile files as needed.
+  :custom
+  (use-package-always-ensure t)
+  )
+
+;; Autocompile files as needed.
 (use-package auto-compile
   :custom
   ;; Use uncompiled file if it is newer than the compiled one.
   (load-prefer-newer t)
+
   :config
   (auto-compile-on-load-mode))