org: add forward declarations

* lisp/org.el: Add forward declarations for a number of functions that
  the compiler otherwise warns about as potentially undefined at
  runtime.

lisp/org.el

@@ -111,6 +111,8 @@ Stars are put in group 1 and the trimmed body in group 2.")
 (unless (boundp 'diary-fancy-buffer)
   (org-defvaralias 'diary-fancy-buffer 'fancy-diary-buffer))
 
+(declare-function org-add-archive-files "org-archive" (files))
+
 (declare-function org-inlinetask-at-task-p "org-inlinetask" ())
 (declare-function org-inlinetask-outline-regexp "org-inlinetask" ())
 (declare-function org-inlinetask-toggle-visibility "org-inlinetask" ())
@@ -118,7 +120,10 @@ Stars are put in group 1 and the trimmed body in group 2.")
 (declare-function org-clock-get-last-clock-out-time "org-clock" ())
 (declare-function org-clock-timestamps-up "org-clock" (&optional n))
 (declare-function org-clock-timestamps-down "org-clock" (&optional n))
+(declare-function org-clock-remove-overlays "org-clock" (&optional beg end noremove))
 (declare-function org-clock-sum-current-item "org-clock" (&optional tstart))
+(declare-function org-clock-update-time-maybe "org-clock" ())
+(declare-function org-clocktable-shift "org-clock" (dir n))
 
 (declare-function orgtbl-mode "org-table" (&optional arg))
 (declare-function org-clock-out "org-clock" (&optional switch-to-state fail-quietly at-time))
@@ -133,6 +138,10 @@ Stars are put in group 1 and the trimmed body in group 2.")
 (declare-function org-agenda-list "org-agenda" (&optional arg start-day span))
 (declare-function org-agenda-redo "org-agenda" (&optional all))
 (declare-function org-table-align "org-table" ())
+(declare-function org-table-begin "org-table" (&optional table-type))
+(declare-function org-table-blank-field "org-table" ())
+(declare-function org-table-end "org-table" (&optional table-type))
+(declare-function org-table-insert-row "org-table" (&optional arg))
 (declare-function org-table-paste-rectangle "org-table" ())
 (declare-function org-table-maybe-eval-formula "org-table" ())
 (declare-function org-table-maybe-recalculate-line "org-table" ())
@@ -179,6 +188,7 @@ Stars are put in group 1 and the trimmed body in group 2.")
 			 (intern (concat "org-babel-expand-body:" lang)))))))
 	org-babel-load-languages))
 
+(declare-function org-babel-tangle-file "ob-tangle" (file &optional target-file lang))
 ;;;###autoload
 (defun org-babel-load-file (file &optional compile)
   "Load Emacs Lisp source code blocks in the Org-mode FILE.