Explicitly set a default codegen backend#87
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This environment variable is set by bootstrap in https://github.com/rust-lang/rust/blob/1.91.1/src/bootstrap/src/core/build_steps/compile.rs#L1326.
The default baked into rustc is changed in Rust 1.92 by rust-lang/rust#146596 from "llvm" to "dummy".