dx9base-0.1: gen/fix_decl.h

#undef DECLARE_INTERFACE
#undef const
#undef CONST
#define const
#define CONST
#undef LPVOID
#define LPVOID void*

#define DECLARE_INTERFACE(i)                    \
    interface i { struct i##Vtbl *lpVtbl; };    \
    typedef struct i##Vtbl i##Vtbl;             \
    struct i##Vtbl                              \
   // empty line