[Bug rust/119333] [15 regression] Rust bootstrap fails with cargo trying to download polonius crates

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119333

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
In libgrust/libformat_parser/Makefile.am, we have:
```
# TODO: Improve `cargo` invocation with host specific flags, possibly creating
a $(CARGO) variable?
$(LIBFORMAT_PARSER): $(srcdir)/Cargo.toml $(srcdir)/src/*.rs
        cargo \
          --config $(srcdir)/.cargo/config \
          build \
            --offline \
            --target-dir . \
            --manifest-path $(srcdir)/Cargo.toml \
            # FIXME: Not always '--release', right?
```

But nothing passing --offline for gcc/rust/checks/error/borrowck/*.

We should really have some global cargo config setting offline.

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