OPM/opm-porsol — pull request #99 by bska (2014-04-05 00:46:06+00:00)
Title: Follow opm-material phase name changes

Commit OPM/opm-material@30c90734ce renamed, among other things
```
FluidSystem::gPhaseIdx -> FluidSystem::gasPhaseIdx
FluidSystem::lPhaseIdx -> FluidSystem::liquidPhaseIdx
```
Adapt to that change to fix the build.