lib: fix bookkeeping for libreadline malloc()s

When libreadline is used, we mistakenly mix in strdup() done in
libreadline with Quagga's lib/memory bookkeeping/counting, leading to
counter underflows on MTYPE_TMP.

Signed-off-by: Lou Berger <lberger@labn.net>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/lib/command.h b/lib/command.h
index 6030069..afc2e3f 100644
--- a/lib/command.h
+++ b/lib/command.h
@@ -526,6 +526,7 @@
 extern void cmd_free_strvec (vector);
 extern vector cmd_describe_command (vector, struct vty *, int *status);
 extern char **cmd_complete_command (vector, struct vty *, int *status);
+extern char **cmd_complete_command_lib (vector, struct vty *, int *status, int islib);
 extern const char *cmd_prompt (enum node_type);
 extern int command_config_read_one_line (struct vty *vty, struct cmd_element **, int use_config_node);
 extern int config_from_file (struct vty *, FILE *, unsigned int *line_num);