Make step bigger to reflect modern needs.

Author: sanja-byelkin

include/my_pthread.h

@@ -694,7 +694,7 @@ extern void my_mutex_end(void);
   We need to have at least 256K stack to handle calls to myisamchk_init()
   with the current number of keys and key parts.
 */
-#define DEFAULT_THREAD_STACK	(289*1024L)
+#define DEFAULT_THREAD_STACK	(290*1024L)
 #endif
 
 #define MY_PTHREAD_LOCK_READ 0