Fix up the configuration rules and update Libc5 piece for Syslogd. (copied code from logread.c)

sysklogd/syslogd.c

@@ -81,6 +81,12 @@ static int local_logging = FALSE;
 /* circular buffer variables/structures */
 #ifdef CONFIG_FEATURE_IPC_SYSLOG
 
+#if __GNU_LIBRARY__ < 5
+#error Sorry.  Looks like you are using libc5.
+#error libc5 shm support isnt good enough.
+#error Please disable CONFIG_FEATURE_IPC_SYSLOG
+#endif
+
 #include <sys/ipc.h>
 #include <sys/sem.h>
 #include <sys/shm.h>