HPCC-9104 Add -checkVersion option to eclcc to control ecl version checking

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #4206 from ghalliday/issue9104

HPCC-9104 Add -checkVersion option to eclcc to control ecl version check

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>