HPCC-10429 Fix ecl-bundle selftest to check for the correct symbol

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #5153 from ghalliday/issue10429

HPCC-10429 Fix ecl-bundle selftest to check for the correct symbol

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>