Safer registry initialization

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
Define URT_MODULE_* for linux

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
Remove conditional checks on tests from root Makefile

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>