Byte-compiler problem reported by Lars Ingebrigtsen in:
https://lists.gnu.org/r/emacs-devel/2022-04/msg01256.html
* lisp/org/org-compat.el (org-at-table.el-p):
Now declared in org-table, not org.
(org-string-collate-lessp): Define the ersatz
org-string-collate-lessp with the same API as the primary form, to
pacify check-declare-file when run on org-macs.
* lisp/org/org-macs.el (org-time-convert-to-integer): Declare.