xfs: split out attribute listing code into separate file

The attribute listing code is not used by userspace, so like the
directory readdir code, split it out into a separate file to
minimise the differences between the filesystem shared with libxfs
in userspace.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index b6158af..94df3ec 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -27,6 +27,7 @@
 
 # highlevel code
 xfs-y				+= xfs_aops.o \
+				   xfs_attr_list.o \
 				   xfs_bit.o \
 				   xfs_buf.o \
 				   xfs_dfrag.o \