Take --constraint into account for configure/build/test

AFAICT, `--constraint` (and `constraints` given in `./cabal.config`) are only taken into account for `cabal install`.  For me It would be useful if they would also be taken into account during development.

Say if I have 

```
constraints:foo==0.2.1
```

in `cabal.config`, but `foo-0.2.2` is installed, I'd like `cabal build` to fail.
