Generate a fatal error if a running Thread object is destroyed

modules/beast_core/threads/beast_Thread.cpp

@@ -42,7 +42,8 @@ Thread::~Thread()
     */
     bassert (! isThreadRunning());
 
-    stopThread (100);
+    if (isThreadRunning())
+        FatalError ("Thread is still running", __FILE__, __LINE__);
 }
 
 //==============================================================================

modules/beast_core/threads/beast_Thread.h

@@ -56,10 +56,7 @@ public:
 
     /** Destructor.
 
-        Deleting a Thread object that is running will only give the thread a
-        brief opportunity to stop itself cleanly, so it's recommended that you
-        should always call stopThread() with a decent timeout before deleting,
-        to avoid the thread being forcibly killed (which is a Bad Thing).
+        If the thread has not been stopped first, this will generate a fatal error.
     */
     virtual ~Thread();