services: nscd: Depend on syslogd.

This gets rid of nscd debug messages on the console at boot time.

* gnu/services/base.scm (nscd-shepherd-service): Add dependency on
'syslogd'.

gnu/services/base.scm

@@ -1428,7 +1428,11 @@ (define (nscd-shepherd-service config)
     (list (shepherd-service
            (documentation "Run libc's name service cache daemon (nscd).")
            (provision '(nscd))
-           (requirement '(user-processes))
+
+           ;; Logs are written with syslog(3), which writes to /dev/console
+           ;; when nobody's listening--ugly.  Thus, wait for syslogd.
+           (requirement '(user-processes syslogd))
+
            (start #~(make-forkexec-constructor
                      (list #$nscd "-f" #$nscd.conf "--foreground")