HPCC-7976 Regression suite tests have hacks for platform()

Remove temporary hacks that are no longer needed

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4353 from richardkchapman/platform-hack

HPCC-7976 Regression suite tests have hacks for platform()

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>