refactor: remove source copying rules#14535
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Making source copying a rule turns out to have numerous disadvantages: 1. requires digesting the source files 2. adds a bunch of overhead to the engine 3. complicates the guarantees we provide for all other rules. Ideally, build inputs for all rules should be immutable. Source copying rules immediately break that. Signed-off-by: Rudi Grinberg <me@rgrinberg.com>
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Making source copying a rule turns out to have numerous disadvantages: