Add __FBSDID()s to libipx

lib/libipx/ipx_addr.c

@@ -32,10 +32,11 @@
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
- *
- * $FreeBSD$
  */
 
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)ipx_addr.c";
 #endif /* LIBC_SCCS and not lint */

lib/libipx/ipx_ntoa.c

@@ -31,6 +31,9 @@
  * SUCH DAMAGE.
  */
 
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)ipx_ntoa.c";
 #endif /* LIBC_SCCS and not lint */