Update libarchive to 2.2.8:

- bsdcpio now supports most of the older SUSv2 specs [not default yet]
- mtree reader to specify file arguments (experimental)
- handle gtar 1.17 sparse files (instead of the older 1.16)
- refined suid/sgid handling: it is optional if the bits can't be reset
  if owner restore is also not requested
- fixes for QNX from Sean Boudreau

archivers/libarchive/Makefile

@@ -1,7 +1,7 @@
-# $NetBSD: Makefile,v 1.19 2007/08/13 18:24:43 joerg Exp $
+# $NetBSD: Makefile,v 1.20 2007/09/15 11:50:58 joerg Exp $
 #
 
-DISTNAME=	libarchive-2.2.6
+DISTNAME=	libarchive-2.2.8
 CATEGORIES=	archivers
 MASTER_SITES=	http://people.freebsd.org/~kientzle/libarchive/src/
 DISTFILES=	# empty