BUG#20578

Backport Valgrind suppression from mysql-5.1:

D 1.4 05/11/23 22:44:54+02:00 monty@mysql.com 5 4 12/0/154
P mysql-test/valgrind.supp
C Remove warning that may happens becasue threads dies in different order

mysql-test/valgrind.supp

@@ -133,6 +133,18 @@
    fun:gzflush
 }
 
+#
+# Warning from my_thread_init becasue mysqld dies before kill thread exists
+#
+
+{
+   my_thread_init kill thread memory loss second
+   Memcheck:Leak
+   fun:calloc
+   fun:my_thread_init
+   fun:kill_server_thread
+}
+
 #
 # Leaks reported in _dl_* internal functions on Linux amd64 / glibc2.3.2.
 #