qobject: Move internals to qobject-internal.h

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201211171152.146877-9-armbru@redhat.com>
diff --git a/qobject/qnum.c b/qobject/qnum.c
index bf1240e..35ba41e 100644
--- a/qobject/qnum.c
+++ b/qobject/qnum.c
@@ -14,6 +14,7 @@
 
 #include "qemu/osdep.h"
 #include "qapi/qmp/qnum.h"
+#include "qobject-internal.h"
 
 /**
  * qnum_from_int(): Create a new QNum from an int64_t