PrintF is likely broken on x86

[ForNeVeR]

See this code:

Cesium/Cesium.Runtime/StdIoFunctions.cs

Lines 219 to 227 in baff13b

	nint pointerValue = ((nint*)varargs)[consumedArgs];
	string pointerValueString = pointerValue.ToString("X");
	streamWriter.Write(pointerValueString);
	consumedBytes += pointerValueString.Length;
	consumedArgs++;
	break;
	case "x":
	case "X":
	nuint hexadecimalValue = ((nuint*)varargs)[consumedArgs];

varargs is casted to a pointer to nint or nuint.

These types have different sizes on different platforms, while our current vararg convention is that we pass an array of 8-byte-sized items (doubles, longs or pointers).

We should also figure out whether it's currently called correctly.