Add DolphinDevice::GetSystemTime to allow for accurate Unix timestamp generation

[vabold]

Upstream's current GetSystemTime function returns the elapsed time. According to the comment, the change was made with the goal of making "buggy emulated code less likely to have issues". However, the old functionality is applicable when generating Unix timestamps for Discord rich presence.

If this implementation of generating these timestamps is not preferred, I am open to suggestions on alternative methods.

[AdmiralCurtiss]

Seems fine to me, untested.

[shuffle2]

I don't understand why the change for Discord would require changing the ioctl?
It's too late now, but I think renaming an enum value in this way should never be done...fwiw.

[jordan-woyak]

I don't understand why the change for Discord would require changing the ioctl? It's too late now, but I think renaming an enum value in this way should never be done...fwiw.

This is just the "dolphin" device, for emulation-aware software to get host information. I guess they wanted unix time from the host instead of using libogc's time function? Gross to change an enum value, but probably only 3 people in the universe are using this feature at least.

[Leseratte10]

Well, Wiimmfi uses it to get accurate in-game timings even if the game lags, so quite a few players are going to be using this feature. But that's using a hardcoded value of 0x01 for the time request through the emulated game, so as long as the behaviour of Ioctl 0x01 doesn't change, no matter what it's called, that should continue working.