Fix more compiler warnings.

* org.el (org-clock-timestamps-up): Fix declarations.

* ob-core.el (org-split-string): Declare function.

lisp/ob-core.el

@@ -54,6 +54,7 @@
 (declare-function org-outline-overlay-data "org" (&optional use-markers))
 (declare-function org-set-outline-overlay-data "org" (data))
 (declare-function org-narrow-to-subtree "org" ())
+(declare-function org-split-string "org" (string &optional separators))
 (declare-function org-entry-get "org"
 		  (pom property &optional inherit literal-nil))
 (declare-function org-make-options-regexp "org" (kwds &optional extra))

lisp/org.el

@@ -117,8 +117,8 @@ Stars are put in group 1 and the trimmed body in group 2.")
 (declare-function org-pop-to-buffer-same-window "org-compat" (&optional buffer-or-name norecord label))
 (declare-function org-at-clock-log-p "org-clock" ())
 (declare-function org-clock-get-last-clock-out-time "org-clock" ())
-(declare-function org-clock-timestamps-up "org-clock" ())
-(declare-function org-clock-timestamps-down "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-sum-current-item "org-clock" (&optional tstart))
 
 (declare-function orgtbl-mode "org-table" (&optional arg))