shellcheck: test_rust.sh issues


In test_rust.sh line 19:
	    "${CARGO:-cargo}" test ${CARGO_ONLINE-"--frozen"} \
                                   ^-- SC2086: Double quote to prevent globbing and word splitting.


In test_rust.sh line 21:
            --target $rustc_host \
                     ^-- SC2086: Double quote to prevent globbing and word splitting.


In test_rust.sh line 22:
	    ${EXTRA_CARGO_OPTIONS} \
            ^-- SC2086: Double quote to prevent globbing and word splitting.

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