- backend update from GZDoom.

The main bulk of this is the new start screen code. To make this work in Raze some more work on the startup procedure is needed.
What this does provide is support for the DOS end-of-game text screens in Duke and SW on non-Windows systems.

source/common/rendering/r_thread.cpp

@@ -32,10 +32,6 @@
 #include "polyrenderer/drawers/poly_triangle.h"
 #include <chrono>
 
-#ifdef WIN32
-void PeekThreadedErrorPane();
-#endif
-
 CVAR(Int, r_multithreaded, 1, CVAR_ARCHIVE | CVAR_GLOBALCONFIG);
 CVAR(Int, r_debug_draw, 0, 0);
 
@@ -101,12 +97,7 @@ void DrawerThreads::WaitForWorkers()
 	std::unique_lock<std::mutex> end_lock(queue->end_mutex);
 	if (!queue->end_condition.wait_for(end_lock, 5s, [&]() { return queue->tasks_left == 0; }))
 	{
-#ifdef WIN32
-		PeekThreadedErrorPane();
-#endif
-		// Invoke the crash reporter so that we can capture the call stack of whatever the hung worker thread is doing
-		int *threadCrashed = nullptr;
-		*threadCrashed = 0xdeadbeef;
+		I_FatalError("Drawer threads did not finish within 5 seconds!");
 	}
 	end_lock.unlock();