Updates kvmx: 56ebebc Do not make virt-viewer and spicy mandatory dependencies

diff --git a/kvmx b/kvmx
index 467ab3fd675641e7f1ae470a951aeaafeee7fc35..56ebebc6d3e79e11fbff8864c4c3668ae93fa532 160000 (submodule)
--- a/kvmx
+++ b/kvmx
@@ -1 +1 @@
-Subproject commit 467ab3fd675641e7f1ae470a951aeaafeee7fc35
+Subproject commit 56ebebc6d3e79e11fbff8864c4c3668ae93fa532