qapi: move inclusions of qemu-common.h from headers to .c files

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/tests/test-qmp-output-visitor.c b/tests/test-qmp-output-visitor.c
index 24a6359..84b1f41 100644
--- a/tests/test-qmp-output-visitor.c
+++ b/tests/test-qmp-output-visitor.c
@@ -12,6 +12,7 @@
 
 #include <glib.h>
 
+#include "qemu-common.h"
 #include "qapi/qmp-output-visitor.h"
 #include "test-qapi-types.h"
 #include "test-qapi-visit.h"