Update Sizzle: independent XML testing

diff --git a/src/sizzle b/src/sizzle
index 5e4e75511d1238a8924dace6982401ab0c253202..9284760ac2e0518502d9dd4cf1305a2156b36d8c 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 5e4e75511d1238a8924dace6982401ab0c253202
+Subproject commit 9284760ac2e0518502d9dd4cf1305a2156b36d8c