3DS - Fix hang on shutdown

src/Backends/Platform/3DS.cpp

@@ -91,7 +91,7 @@ bool Backend_SystemTask(bool active)
 {
 	(void)active;
 
-	return aptMainLoop();
+	return true;
 }
 
 void Backend_GetKeyboardState(bool *keyboard_state)

src/Draw.cpp

@@ -6,6 +6,10 @@
 #include <string.h>
 #include <string>
 
+#ifdef _3DS
+ #include <3ds.h>
+#endif
+
 #include "WindowsWrapper.h"
 
 #include "Backends/Misc.h"
@@ -76,6 +80,14 @@ BOOL Flip_SystemTask(void)
 
 	RenderBackend_DrawScreen();
 
+#ifdef _3DS
+	// This would go in Backend_SystemTask, but that causes a hang
+	// because of a race condition: aptMainLoop cannot be called
+	// between C3D_FrameBegin and C3D_FrameEnd
+	if (!aptMainLoop())
+		return false;
+#endif
+
 	if (RestoreSurfaces())
 	{
 		RestoreStripper();