util: add some extra stubs for qemu modules initialization

Avoid extra ifdef-ery when optionally supporting modules, as done in
audio-test (and vl.c).

Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

system/vl.c

@@ -2889,10 +2889,8 @@ void qemu_init(int argc, char **argv)
 
     os_setup_limits();
 
-#ifdef CONFIG_MODULES
     module_init_info(qemu_modinfo);
     module_allow_arch(target_name());
-#endif
 
     qemu_init_subsystems();
 

util/module.c

@@ -396,6 +396,9 @@ void qemu_load_module_for_opts(const char *group)
 
 #else
 
+const QemuModinfo qemu_modinfo[] = {};
+
+void module_init_info(const QemuModinfo *info) {}
 void module_allow_arch(const char *arch) {}
 void qemu_load_module_for_opts(const char *group) {}
 int module_load(const char *prefix, const char *name, Error **errp) { return 2; }