MDEV-11718 5.5 rpl and federated tests massively fail in buildbot with valgrind

Problem:- When MariaDB is compiled with jemalloc support, And we run mtr valgrind
test, valgrind interferes with libjemalloc and returns false errors.

Solution:- Run valgrind with --soname-synonyms=somalloc=libjemalloc* or
--soname-synonyms=somalloc=NONE depending on whether we are dynamically
linking or statically linking.

Signed-off-by: Sachin Setiya <sachin.setiya@mariadb.com>

mysql-test/valgrind.supp

@@ -1074,3 +1074,13 @@
    ...
    fun:pthread_create*
 }
+
+{
+   Memory Leak in loader and valgrind malloc
+   Memcheck:Leak
+   match-leak-kinds:reachable
+   obj:*/vgpreload_memcheck*.so
+   ...
+   obj:*/ld-*.so
+   ...
+}