use correct CARGO_HOME in test_rust.sh
make check currently doesn't seem to work with --enable-rust without --enable-cargo-online-mode.
It looks like cargo expects CARGO_HOME to point to the .cargo directory itself, not the directory containing it. Builds seem to work anyway because we cd to a directory where cargo can find a .cargo directory, even though we set CARGO_HOME incorrectly.
This might be making Jenkins builds fail too:
20:04:05 FAIL: src/test/test_rust.sh
20:04:05 ===========================
20:04:05
20:04:05 error: attempting to make an HTTP request, but --frozen was specified
20:04:05 error: attempting to make an HTTP request, but --frozen was specifiedThis incarnation of this bug seems to be in the fix for #26258 (moved), but similar problems seem to exist in releases as far back as 0.3.1.
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