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[cfg_match] Adjust syntax A year has passed since the creation of #115585 and the feature, as expected, is not moving forward. Let's change that. This PR proposes changing the arm's syntax from `cfg(SOME_CONDITION) => { ... }` to `SOME_CODITION => {}`. ```rust match_cfg! { unix => { fn foo() { /* unix specific functionality */ } } target_pointer_width = "32" => { fn foo() { /* non-unix, 32-bit functionality */ } } _ => { fn foo() { /* fallback implementation */ } } } ``` Why? Because after several manual migrations in https://github.com/rust-lang/rust/pull/116342 it became clear, at least for me, that `cfg` prefixes are unnecessary, verbose and redundant. Again, everything is just a proposal to move things forward. If the shown syntax isn't ideal, feel free to close this PR or suggest other alternatives.