Don't use PATH_MAX for FN_REFLEN as this uses too much stack space

Larger stack size neaded for open table on x86 64 bit
Fix failing test cases
Deleted symlink from bk

sql/sql_parse.cc

@@ -1201,6 +1201,7 @@ pthread_handler_t handle_bootstrap(void *arg)
   char *buff;
 
   /* The following must be called before DBUG_ENTER */
+  thd->thread_stack= (char*) &thd;
   if (my_thread_init() || thd->store_globals())
   {
 #ifndef EMBEDDED_LIBRARY