qapi: use middle mode in QMP server

Use the new middle mode within the existing QMP server.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/Makefile.objs b/Makefile.objs
index 8d23fbb..587ec36 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -406,6 +406,8 @@
 qapi-nested-y += qmp-registry.o qmp-dispatch.o
 qapi-obj-y = $(addprefix qapi/, $(qapi-nested-y))
 
+common-obj-y += qmp-marshal.o qapi-visit.o qapi-types.o $(qapi-obj-y)
+
 ######################################################################
 # guest agent