build: Bump dxcommon for relevant fix-gnulib updates.

diff --git a/common b/common
index 3bc1572c6a889842c58ab9d1a7958708b2ba8a42..566987f66af50062d1de9aaba7695b1ef265754f 160000 (submodule)
--- a/common
+++ b/common
@@ -1 +1 @@
-Subproject commit 3bc1572c6a889842c58ab9d1a7958708b2ba8a42
+Subproject commit 566987f66af50062d1de9aaba7695b1ef265754f