Tests fail on mac

Tests were failing when building on my Mac (10.9.3):

```Creating libUnitTest++.a library...
Linking TestUnitTest++...
Running unit tests...
:107: error: Failure in test: Expected 2 but was 0
FAILURE: 1 out of 174 tests failed (1 failures).```

Patched as per makestuff/libutpp@e8194a74846959b18958236874ebc361fe036cc5