Serialize some more kernel objects

src/core/hle/kernel/mutex.cpp

@@ -4,6 +4,7 @@
 
 #include <map>
 #include <vector>
+#include "common/archives.h"
 #include "common/assert.h"
 #include "core/core.h"
 #include "core/hle/kernel/errors.h"
@@ -12,6 +13,8 @@
 #include "core/hle/kernel/object.h"
 #include "core/hle/kernel/thread.h"
 
+SERIALIZE_EXPORT_IMPL(Kernel::Mutex)
+
 namespace Kernel {
 
 void ReleaseThreadMutexes(Thread* thread) {