HPCC-10925 Allow abort when compiling to kill gcc process

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-10925 Allow new process group creation to be configured

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #5506 from ghalliday/issue10925

HPCC-10925 Allow abort when compiling to kill gcc process

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>