docs/devel/build-system.rst claims
``config-host.h``, ``$TARGET-NAME/config-target.h``,
``$TARGET-NAME/config-devices.h``
These files are used by source code to determine what features
are enabled. They are generated from the contents of the corresponding
``*.h`` files using the scripts/create_config program. This extracts
relevant variables and formats them as C preprocessor macros.
scripts/create_config went away in your commit 859aef026e "meson:
replace create-config with meson configure_file", 2020-08-21. Please
update build-system.rst.
