Sizzle: provide backwards-compatibility for creating custom pseudos with arguments...

diff --git a/src/sizzle b/src/sizzle
index 7a6754daa0786f2c9dbf7e9bbf250a8c78fa53df..3dc21f2fb15d7fdf9d389add65de4a66c9ed4585 160000 (submodule)
--- a/src/sizzle
+++ b/src/sizzle
@@ -1 +1 @@
-Subproject commit 7a6754daa0786f2c9dbf7e9bbf250a8c78fa53df
+Subproject commit 3dc21f2fb15d7fdf9d389add65de4a66c9ed4585