org.el: Silence some byte-compiler warnings

The remaining ones are related to the org-refile.el movement in
f636cf91b (New org-refile.el file with refile definitions,
2020-02-05).

lisp/org.el

@@ -128,6 +128,7 @@ Stars are put in group 1 and the trimmed body in group 2.")
 (declare-function org-babel-do-in-edit-buffer "ob-core" (&rest body) t)
 (declare-function org-babel-tangle-file "ob-tangle" (file &optional target-file lang))
 (declare-function org-beamer-mode "ox-beamer" (&optional prefix) t)
+(declare-function org-clock-auto-clockout "org-clock" ())
 (declare-function org-clock-cancel "org-clock" ())
 (declare-function org-clock-display "org-clock" (&optional arg))
 (declare-function org-clock-get-last-clock-out-time "org-clock" ())
@@ -177,6 +178,7 @@ Stars are put in group 1 and the trimmed body in group 2.")
 (declare-function org-inlinetask-outline-regexp "org-inlinetask" ())
 (declare-function org-inlinetask-toggle-visibility "org-inlinetask" ())
 (declare-function org-latex-make-preamble "ox-latex" (info &optional template snippet?))
+(declare-function org-num-mode "org-num" (&optional arg))
 (declare-function org-plot/gnuplot "org-plot" (&optional params))
 (declare-function org-tags-view "org-agenda" (&optional todo-only match))
 (declare-function org-timer "org-timer" (&optional restart no-insert))