drutil test failing nondet on Windows

http://dynamorio.org/CDash/testDetails.php?test=152138&build=14606
Test: code_api|client.drutil-test (Failed)
Build: debug-internal-64 (X64.Windows7.VS2010.Kraken) on 2016-11-15 00:37:34
Repository revision: 2943c0569adb5e393722dcc7704454c1e29b4580

The test prints an extra line:
```
in wnd_callback 0x0000000000000219 7
```

```
Fail Reason Required regular expression not found.Regex=[^About to create thread?
in wnd_callback 0x0*0000024 0?
in wnd_callback 0x0*0000081 0?
in wnd_callback 0x0*0000083 0?
in wnd_callback 0x0*0000001 0?
in wnd_callback 0x0*0008001 3 0?
About to crash?
Inside handler?
in wnd_callback 0x0*0008001 0 2?
Got message 0x0*0008001 1 3?
All done?
all done?
$
]

Test output:
About to create thread
in wnd_callback 0x0000000000000024 0
in wnd_callback 0x0000000000000081 0
in wnd_callback 0x0000000000000083 0
in wnd_callback 0x0000000000000001 0
in wnd_callback 0x0000000000008001 3 0
About to crash
Inside handler
in wnd_callback 0x0000000000000219 7
in wnd_callback 0x0000000000008001 0 2
Got message 0x0000000000008001 1 3
All done
all done
```