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spirv-builder only looks for the exact
librustc_codegen_spirv.{so,dylib,dll} filename in the dylib search path.
That works in the rust-gpu workspace, but it misses external build.rs
consumers where Cargo only exposes hashed deps artifacts such as
librustc_codegen_spirv-<hash>.so. This showed up in a downstream
workspace update to current rust-gpu main where the consumer path only
had hashed backend artifacts available to default SpirvBuilder
discovery.
Keep preferring the exact filename when present, then fall back to the
newest hashed rustc_codegen_spirv dylib in the same search paths. Add
tests for exact matches, hashed fallback, and exact-over-hashed
precedence.