Reenable --sparse option in extract mode, see

http://savannah.gnu.org/patch/?func=detailitem&item_id=3705

diff -uprk.orig cpio-2.6.orig/src/main.c cpio-2.6/src/main.c

--- cpio-2.6.orig/src/main.c	2004-11-23 00:42:18 +0000

+++ cpio-2.6/src/main.c	2005-01-31 21:44:21 +0000

@@ -584,7 +584,6 @@ process_args (int argc, char *argv[])

       CHECK_USAGE(reset_time_flag, "--reset", "--extract");

       CHECK_USAGE(xstat != lstat, "--dereference", "--extract");

       CHECK_USAGE(append_flag, "--append", "--extract");

-      CHECK_USAGE(sparse_flag, "--sparse", "--extract");

       CHECK_USAGE(output_archive_name, "-O", "--extract");

       if (to_stdout_option)

 	{