Update xvm-devconfig to version 0.59

Requested by iannucci/root@ATHENA.MIT.EDU

diff --git a/xvm-devconfig b/xvm-devconfig
index 787c9d5..f50eb77 160000 (submodule)
--- a/xvm-devconfig
+++ b/xvm-devconfig
@@ -1 +1 @@
-Subproject commit 787c9d5f1aa661d26328f9dd19bd7863195336a3
+Subproject commit f50eb773fa3a2b207b32c0475e7b6df5477ae159