update X11 version.
#define NP2VER_CORE "ver.0.83" // #define NP2VER_WIN9X // #define NP2VER_MACOS9 // #define NP2VER_MACOSX #define NP2VER_X11 "-20111224" // #define NP2VER_WINCE // #define NP2VER_SDLZAU