Rollup merge of #133720 - c410-f3r:cfg-match-foo-bar-baz, r=joshtriplett

[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.

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