OPM/opm-core — pull request #71 by bska (2012-10-14 21:29:02+00:00)
Title: Suppress warning about unused variable in !HAVE_ERT case.

This applies the standard trick of using
```C++
static_cast(variable)
```
to suppress the GCC warning about an unused variable. This particular warning happens only in the `!HAVE_ERT` case.