mysql_print_status() missing final fflush()

See http://bugs.mysql.com/bug.php?id=64048

Description:
When requesting debug status output with

  mysqladmin debug

the output in the error log (assuming that mysqld_safe was used)
seems to be truncated at first as the mallinfo() related part
is missing, this part will only show up in the error log when
debug is called a 2nd time. This makes the missing part of the
first invocation appear but then again the mallinfo() output
for the 2nd call is missing

How to repeat:
Issue "mysqladmin debug", check output in mysql error log for the "Memory status:"
section ...

Suggested fix:
add an extra fflush(stdout) at the very end of mysql_print_status() in sql/sql_test.cc