Implement sceKernelRefer*MutexStatus*()

The good news is none of the actual implementation had to change, but this makes me feel more warm and confident about the accuracy of the implementation.

I have to wonder how one would get a uid for a LwMutex if it's supposed to be opaque... maybe it's not really or maybe from threadman's list?  Well, it works as advertised anyway.

Updates tests, so please accept hrydgard/pspautotests#63 first.

-[Unknown]