etc/config.sh/metis: Updated for changes to ThirdParty-dev/Allwmake

See commit b627924a4bf104521b567d3aa3dc80c864325b1a

    Allwmake: Added scripted changes for REALTYPEWIDTH and IDXTYPEWIDTH
    Patch contributed by Bruno Santos
    Resolves bug-report http://bugs.openfoam.org/view.php?id=2085