Why does this file keep changing?
Implemented minimal System.Drawing stubs for Xamarin.Android targets.
Use OpenTK.Minimal to stub out missing System.Drawing functionality
when building on Android or iOS platforms.
System.Drawing is required for Point, Size and Rectangle types.
Added Xamarin.Android target
Fixed compilation on desktop platforms.
[DllImport] registry methods when the Microsoft.Win32 namespace is not
available (untested).