Pull in packed options fix from dxcommon.

This fixes build failures on the Sun Studio compiler.

diff --git a/common b/common
index e599119f0492b01f1f21a8cce8d695c314dab3b1..70c84546fa5ecaba26e4ed021b292a5580f304f0 160000 (submodule)
--- a/common
+++ b/common
@@ -1 +1 @@
-Subproject commit e599119f0492b01f1f21a8cce8d695c314dab3b1
+Subproject commit 70c84546fa5ecaba26e4ed021b292a5580f304f0