Rollup merge of #135340 - obeis:explicit-extern-abis, r=traviscross,nadrieril
Add `explicit_extern_abis` Feature and Enforce Explicit ABIs The unstable `explicit_extern_abis` feature is introduced, requiring explicit ABIs in `extern` blocks. Hard errors will be enforced with this feature enabled in a future edition. RFC rust-lang/rfcs#3722 Update #134986
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