Fix t00014 on macos

For some reason `t00014` fails on macos (even when built with Homebrew Clang):

```
/Users/bkryza/devel/clang-uml-033/tests/t00014/test_case.h:142: FAILED:
  REQUIRE_THAT( puml, IsDependency(_A("R<T>"), _A("A<char,std::string>")) )
with expansion:
```