Fix remaining byte-compile warnings in loaddefs.el

* lisp/progmodes/compile.el (compilation--default-buffer-name):
* lisp/kmacro.el (kmacro-name-last-macro):
* lisp/emacs-lisp/package.el (package--activate-all): Autoload to
avoid byte-compilation warnings when byte-compiling loaddefs.el.

lisp/emacs-lisp/package.el

@@ -1663,6 +1663,7 @@ The variable `package-load-list' controls which packages to load."
       (require 'package)
       (package--activate-all)))))
 
+;;;###autoload
 (defun package--activate-all ()
   (dolist (elt (package--alist))
     (condition-case err

lisp/kmacro.el

@@ -920,6 +920,7 @@ The ARG parameter is unused."
 	  (vectorp f)                   ;FIXME: Deprecated.
 	  (kmacro-p f)))))
 
+;;;###autoload
 (defun kmacro-name-last-macro (symbol)
   "Assign a name to the last keyboard macro defined.
 Argument SYMBOL is the name to define.

lisp/progmodes/compile.el

@@ -1792,6 +1792,7 @@ Otherwise, construct a buffer name from NAME-OF-MODE."
                #'compilation--default-buffer-name)
            name-of-mode))
 
+;;;###autoload
 (defun compilation--default-buffer-name (name-of-mode)
   (cond ((or (eq major-mode (intern-soft name-of-mode))
              (eq major-mode (intern-soft (concat name-of-mode "-mode"))))