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OpenTK exception on startup: entry point in SDL2.dll not found

See original GitHub issue

12.01.18 20:15:58: fatal error:
12.01.18 20:15:58: System.EntryPointNotFoundException: Der Einstiegspunkt "SDL_GetGlobalMouseState" wurde nicht in der DLL "SDL2.dll" gefunden.
12.01.18 20:15:58: bei OpenTK.Platform.SDL2.SDL.GetGlobalMouseState(Int32& hx, Int32& hy)
12.01.18 20:15:58: bei OpenTK.Platform.SDL2.Sdl2Mouse.GetCursorState()
12.01.18 20:15:58: bei OpenTK.Input.Mouse.GetCursorState()
12.01.18 20:15:58: bei osu.Framework.Input.Handlers.Mouse.OpenTKRawMouseHandler.<>c__DisplayClass9_0.<Initialize>b__1()
12.01.18 20:15:58: bei osu.Framework.Threading.ScheduledDelegate.RunTask()
12.01.18 20:15:58: bei osu.Framework.Threading.Scheduler.Update()
12.01.18 20:15:58: bei osu.Framework.Threading.GameThread.ProcessFrame()
12.01.18 20:15:58: bei osu.Framework.Platform.GameHost.<Run>b__90_1(Object <p0>, FrameEventArgs <p1>)
12.01.18 20:15:58: bei System.EventHandler`1.Invoke(Object sender, TEventArgs e)
12.01.18 20:15:58: bei OpenTK.GameWindow.RaiseUpdateFrame(Stopwatch watch, Double elapsed, Double& timestamp)
12.01.18 20:15:58: bei OpenTK.GameWindow.DispatchUpdateFrame(Stopwatch watch)
12.01.18 20:15:58: bei OpenTK.GameWindow.Run(Double updates_per_second, Double frames_per_second)
12.01.18 20:15:58: bei osu.Framework.Platform.GameHost.Run(Game game)
12.01.18 20:15:58: bei osu.Desktop.Program.Main(String[] args)

not really sure what causes or fixes it but visual tests work and after compiling them debug works too