api: Expose the ares_library_initialized() function

ares.h

@@ -296,6 +296,8 @@ typedef int  (*ares_sock_create_callback)(ares_socket_t socket_fd,
 
 CARES_EXTERN int ares_library_init(int flags);
 
+CARES_EXTERN int ares_library_initialized(void);
+
 CARES_EXTERN void ares_library_cleanup(void);
 
 CARES_EXTERN const char *ares_version(int *version);

ares_private.h

@@ -311,8 +311,6 @@ struct ares_channeldata {
 int ares__timedout(struct timeval *now,
                    struct timeval *check);
 
-/* returns ARES_SUCCESS if library has been initialized */
-int ares_library_initialized(void);
 void ares__send_query(ares_channel channel, struct query *query,
                       struct timeval *now);
 void ares__close_sockets(ares_channel channel, struct server_state *server);