Stop building buildd chroots with --xattrs until we move to python3.

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (2.539) cosmic; urgency=medium
+
+  * Stop building buildd chroots with --xattrs until we move to python3.
+
+ -- Adam Conrad <adconrad@ubuntu.com>  Thu, 20 Sep 2018 02:52:10 -0600
+
 livecd-rootfs (2.538) cosmic; urgency=medium
 
   * Add a buildd subproject.

live-build/auto/build

@@ -505,7 +505,7 @@ elif [ "$SUBPROJECT" = buildd ]; then
 	# buildd chroots about twice as fast as xz and about five times as
 	# fast as bzip2.
 	tar --transform='s,^binary,chroot-autobuild,' \
-		--sort=name --numeric-owner --xattrs \
+		--sort=name --numeric-owner \
 		-czf "$PREFIX.rootfs.tar.gz" binary
 fi