librcl: Add stub implementation of GetPlatformIDs()

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
test: Add an automated test

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
test: Add bitonic_sort test

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>