RTC timer precision very inaccurate

[InvisibleUp]

On the Win32 build at 1x speed, the emulated clock (Apple > Alarm Clock) tends to hang on some seconds for too long, and flat-out skips others. See the below .GIF.

This issue only occurs at 1x speed. This issue appears in a standard Mini vMac build.

Note that in Mini vMac, the RTC is updated by the emulator. Presumably, it isn't being updated often enough (possibly once every 60 frames?). We really really don't need that optimization, so let's just check it every frame instead.