MacroAddFileDependencies: Explicitly deprecate by documentation
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.
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