This module has been discouraged since commit 1e20be31 (STYLE: add
documentation for MACRO_ADD_FILE_DEPENDENCIES(), 2009-07-14,
v2.8.0~433).  It has been listed in the `cmake-modules(7)` manual
as deprecated since commit df780bcc (Help: Move deprecated modules to
appropriate section., 2018-11-12, v3.14.0-rc1~374^2).  Add the explicit
deprecation mark in its documentation.