Bump dxcommon to improve portability to systems without "join"

diff --git a/common b/common
index 6532aaac91a7efd99eb74726679c4000459e7bb3..afc0149dd2e0393d529c5322f25396039872f787 160000 (submodule)
--- a/common
+++ b/common
@@ -1 +1 @@
-Subproject commit 6532aaac91a7efd99eb74726679c4000459e7bb3
+Subproject commit afc0149dd2e0393d529c5322f25396039872f787