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1846523bb7
Make MLIR Python sources idempotent by moving the custom commands off the custom target for each source. Previously, a custom target was created for each MLIR Python source file and a custom command added to symlink it to a destination path. However this causes the build to not be idempotent because custom targets always run. Instead, this PR separates the symlink/copy to destination paths into custom commands and makes the custom target depend on the output. That prevents re-running them and restores idempotency. Testing: - Build with `-D MLIR_ENABLE_BINDINGS_PYTHON=ON`. Prior to this change, the build is not idempotent (building twice re-runs the symlink/copy command for Python source targets). After this change it is idempotent.