Disallow duplicated extern declarations

Disallow duplicated extern declarations

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A-FFIArea: Foreign function interface (FFI)C-feature-requestCategory: A feature request, i.e: not implemented / a PR.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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mod a {
    extern {
        fn func();
    }
}

mod b {
    extern {
        fn func(i: i8); // different signature
    }
}

Currently rustc accepts this, but I think it should be disallowed to reduce potential mistakes.

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A-FFIArea: Foreign function interface (FFI)C-feature-requestCategory: A feature request, i.e: not implemented / a PR.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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