Update xvm-devconfig to version 0.89

Requested by glasgall/root@ATHENA.MIT.EDU

diff --git a/xvm-devconfig b/xvm-devconfig
index 5af6a02..0d4b811 160000 (submodule)
--- a/xvm-devconfig
+++ b/xvm-devconfig
@@ -1 +1 @@
-Subproject commit 5af6a02428d3061e9fd31a59a710bf07f3bd018d
+Subproject commit 0d4b8117ef84d9b4395777666ccf2e6c4ef79b43