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016bc61312
The `rustc` probe done in our build scripts needs to pass `--target` to get the correct configuration, which usually comes from the `TARGET` environment variable. However, for targets specified via a `target.json` file, `TARGET` gets set to the file name without an extension or path. `rustc` will check a search path to attempt to locate the file, but this is likely to fail since the directory where Cargo invokes build scripts (and hence where those scripts invoke `rustc`) might not have any relation to the JSON spec file. Resolve this for now by leaving `f16` and `f128` disabled if the `rustc` command fails. Result of the discussion at CARGO-14208 may eventually provide a better solution. A CI test is also added since custom JSON files are an edge case that could fail in other ways. I verified this fails without the fix here. The JSON file is the output for `thumbv7em-none-eabi`, just renamed so `rustc` doesn't identify it.