Xfail the remfiles09b test.

* tests/remfiles09b.at: Turn into expected failure.

tests/remfiles09b.at

@@ -29,6 +29,8 @@
 AT_SETUP([remove-files on full directory in -c/incr. mode])
 AT_KEYWORDS([create incremental remove-files remfiles09 remfiles09b])
 
+AT_XFAIL_IF(true) # we expect to fail in tar 1.27
+
 AT_TAR_CHECK([
 AT_SORT_PREREQ
 mkdir foo
@@ -38,7 +40,6 @@ tar -cvf foo.tar --incremental --remove-files foo
 TARSTAT=$?
 decho B
 find .
-test $TARSTAT -ne 0 && AT_SKIP_TEST   # we expect to fail in tar 1.27
 ],
 [0],
 [A