Merge my changes from 2.39-6:
    Wed Feb 25 2009 Kevin Kofler <Kevin@tigcc.ticalc.org> - 2.43-4
    - Updated 64bit-fixes patch (remove some more -m32 use).
    - Drop ExclusiveArch, not needed with the above.
    - Obsoletes/Provides nsis and nsis-data for migration path from CalcForge.
    - Disable NSIS Menu (does not work on *nix, see specfile comment for
        details).
    - Drop BR wxGTK-devel.