don't test SVG on IE6

diff --git a/src/sizzle b/src/sizzle
index 21c1cd6f10cdbbcb7712cdfd50a17f419e9b02b7..1fd02c5d8edc72ab7b68bafd3f65ad41c4dba6e6 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 21c1cd6f10cdbbcb7712cdfd50a17f419e9b02b7
+Subproject commit 1fd02c5d8edc72ab7b68bafd3f65ad41c4dba6e6