Bug#32059 thread_id is a long rather than ulong

thread_id should be defined as a dword (32 bit unsigned).


mysys/my_thr_init.c:
  * Change variable thread_id to unsigned long.

mysys/my_thr_init.c

@@ -223,7 +223,7 @@ void my_thread_global_end(void)
 #endif
 }
 
-static long thread_id=0;
+static ulong thread_id=0;
 
 /*
   Allocate thread specific memory for the thread, used by mysys and dbug