compiler: do not emit rustfmt_skip inner attr, since it is unstable #479
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Codegen emitted an inner
cfg_attr
attribute, which caused problems with stable Rust (according to tikv/raft-rs#390 (comment)). This PR removes that line. The user can always add it as an outer attribute if they want to skip formatting.cc tikv/raft-rs#390
PTAL @BusyJay @overvenus