Let's not double-quote EXTRA_CARGO_OPTIONS after all

src/test/test_rust.sh

@@ -14,12 +14,13 @@ rustc_host=$(rustc -vV | grep host | sed 's/host: //')
 
 for cargo_toml_dir in "${abs_top_srcdir:-../../..}"/src/rust/*; do
     if [ -e "${cargo_toml_dir}/Cargo.toml" ]; then
+        # shellcheck disable=SC2086
 	cd "${abs_top_builddir:-../../..}/src/rust" && \
 	    CARGO_TARGET_DIR="${abs_top_builddir:-../../..}/src/rust/target" \
 	    "${CARGO:-cargo}" test "${CARGO_ONLINE-'--frozen'}" \
             --features "test_linking_hack" \
             --target "$rustc_host" \
-	    "${EXTRA_CARGO_OPTIONS}" \
+	    ${EXTRA_CARGO_OPTIONS} \
 	    --manifest-path "${cargo_toml_dir}/Cargo.toml" || exitcode=1
     fi
 done