HPCC-11555 Mangled GeneratedDll name doesn't need RTM_CREATE_ADD

RTM_CREATE_ADD a leftover from before the mangled GeneratedDll
id's were introduced.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #5968 from jakesmith/hpcc-11555-5.x

HPCC-11555 Mangled GeneratedDll name doesn't need RTM_CREATE_ADD

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>