HPCC-8775 Remove duplicate definition of prototypeAtom

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #3947 from ghalliday/issue8775

HPCC-8775 Remove duplicate definition of prototypeAtom

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>