[File] [PATCH] Magdir/rust for Rust incremental compilation metadata

[Alexandre IOOSS]

Hello,

I would like to propose a new signature for incremental compilation 
metadata generated by the Rust compiler.

When compiling a Rust crate with Cargo, a `target/[debug|release]` 
folder is created inside the crate. This folder usually contains a 
`incremental` sub-folder that holds metadata for incremental 
compilation. I propose to add a new signature for these files:
```
$ file dep-graph.bin query-cache.bin --magic-file rust.magic
dep-graph.bin:   Rust incremental compilation metadata, rustc 1.56.1
query-cache.bin: Rust incremental compilation metadata, rustc 1.56.1
```

Attached, you will find the signature.

Best regards,

-- 
Alexandre
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