Updates kvmx: b54bcfd Fix: more qemu/screen version handling

diff --git a/kvmx b/kvmx
index 3571ea4a5f71afbcdcd915f2a84a6622e3cb56be..b54bcfd68bcb854bf9733359de52f0df76e58713 160000 (submodule)
--- a/kvmx
+++ b/kvmx
@@ -1 +1 @@
-Subproject commit 3571ea4a5f71afbcdcd915f2a84a6622e3cb56be
+Subproject commit b54bcfd68bcb854bf9733359de52f0df76e58713