Changed the number of test iterations since this makes test time

go from 623 seconds to 11 seconds on AMD64.
This is because we have no native atomic implementation on AMD64, 
so the rwlock-based implementation is used, which is  a bit slow.  
It will be probably be optimized for AMD64 quite soon, but for now 
this test case will do fewer iterations.

unittest/mysys/my_atomic-t.c

@@ -166,9 +166,9 @@ int main()
   pthread_cond_init(&cond, 0);
   my_atomic_rwlock_init(&rwl);
 
-  test_atomic("my_atomic_add32", test_atomic_add_handler, 100,1000000);
-  test_atomic("my_atomic_swap32", test_atomic_swap_handler, 100,1000000);
-  test_atomic("my_atomic_cas32", test_atomic_cas_handler, 100,1000000);
+  test_atomic("my_atomic_add32", test_atomic_add_handler, 100,10000);
+  test_atomic("my_atomic_swap32", test_atomic_swap_handler, 100,10000);
+  test_atomic("my_atomic_cas32", test_atomic_cas_handler, 100,10000);
 
   pthread_mutex_destroy(&mutex);
   pthread_cond_destroy(&cond);