Make the column mandatory after #+include:.

* org-publish.el (org-publish-cache-file-needs-publishing):
Make the column mandatory after #+include:.

* org-exp.el (org-export-handle-include-files): Ditto.

lisp/org-exp.el

@@ -2412,7 +2412,7 @@ TYPE must be a string, any of:
   (let ((case-fold-search t)
 	params file markup lang start end prefix prefix1 switches all minlevel currentlevel addlevel lines)
     (goto-char (point-min))
-    (while (re-search-forward "^#\\+include:?[ \t]+\\(.*\\)" nil t)
+    (while (re-search-forward "^#\\+include:[ \t]+\\(.*\\)" nil t)
       (setq params (read (concat "(" (match-string 1) ")"))
 	    prefix (org-get-and-remove-property 'params :prefix)
 	    prefix1 (org-get-and-remove-property 'params :prefix1)

lisp/org-publish.el

@@ -1122,7 +1122,7 @@ so that the file including them will be republished as well."
       (setq buf (find-file (expand-file-name filename)))
       (with-current-buffer buf
 	(goto-char (point-min))
-	(while (re-search-forward "^#\\+include:?[ \t]+\"\\([^\t\n\r\"]*\\)\"[ \t]*.*$" nil t)
+	(while (re-search-forward "^#\\+include:[ \t]+\"\\([^\t\n\r\"]*\\)\"[ \t]*.*$" nil t)
 	  (let* ((included-file (expand-file-name (match-string 1))))
 	    (add-to-list 'included-files-ctime
 			 (org-publish-cache-ctime-of-src included-file) t))))