bindbc.sfml , sfVideoMode , Error: undefined identifier

[Alain De Vos]

After adding
```
"versions": [
     "SFML_Audio",
     "SFML_Graphics",
     "SFML_250",
]
```
to dub.json it compiles.
The sfml library the freebsd os is version : "sfml-2.5.1_2"     .