add freeifaddrs(3), which reclaims region allocated by getifaddrs(3).

in sync with kame and bsdi.

src/include/ifaddrs.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ifaddrs.h,v 1.1 2000/02/23 06:55:59 itojun Exp $	*/
+/*	$OpenBSD: ifaddrs.h,v 1.2 2000/02/23 15:39:53 itojun Exp $	*/
 
 /*
  * Copyright (c) 1995, 1999
@@ -22,7 +22,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	BSDI ifaddrs.h,v 2.4 1999/03/15 20:59:28 jch Exp
+ *	BSDI ifaddrs.h,v 2.5 2000/02/23 14:51:59 dab Exp
  */
 
 #ifndef	_IFADDRS_H_
@@ -50,6 +50,7 @@ struct ifaddrs {
 
 __BEGIN_DECLS
 extern int getifaddrs __P((struct ifaddrs **));
+extern void freeifaddrs __P((struct ifaddrs *));
 __END_DECLS
 
 #endif