s3-rpcclient: Fix bug #7880: cmd_spoolss_deletedriver() returned without checking...

s3-rpcclient: Fix bug #7880: cmd_spoolss_deletedriver() returned without checking all architectures.

Continues now with next architecture if no driver is available.

Because of the broken behavior of the rpccli_*() functions,
we need special error code handling.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit f5af66e67d7c6d62315671c0cf57f47973316226)
(cherry picked from commit dc63f45b523deb5c3d0c4be4239507e5fc4f6a40)
(cherry picked from commit fbcecec057bc05d6fcbdab3ef90d32c56335e833)