busybox: don't remove S01logging when CONFIG_SYSLOGD is disabled

busybox: don't remove S01logging when CONFIG_SYSLOGD is disabled

The current busybox.mk explicitly removes S01logging if CONFIG_SYSLOGD
is disabled in the Busybox configuration. However:

 - This causes the removal of the S01logging script potentially
   installed by another package (currently syslog-ng, rsyslog and
   sysklogd can all install a S01logging script).

 - We generally don't try to clean-up stuff that we may have installed
   in a previous make invocation and that is no longer needed
   following a configuration change.

Fixes bug #10176

Reported-by: Karl Krach <mail@kkrach.de>
Fix-provided-by: Karl Krach <mail@kkrach.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>