The `force_build_tools` config option was added a long time ago to
brute force the _build-tools_ version by trying to replace the value
in `build.gradle` files. This is never something that should be used
in production, since the app's build metadata should specify this kind
of thing. And now that we're moving towards _androguard_ for
everything except fdroid build and fdroid publish, _build-tools_ will
no longer even be used in the other commands.
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