Rewind aom repo one commit back in preparation for submodule url switch
diff --git a/ext/aom b/ext/aom
index 7e4c174..3e3b934 160000
--- a/ext/aom
+++ b/ext/aom
@@ -1 +1 @@
-Subproject commit 7e4c174808225cb0af39e765230d4a81c9ccae06
+Subproject commit 3e3b9342a20147ec6e4f89aa290e20277c1260ce