message: tools/uhyve-cpu: remove unused definition of _kvm_segment
diff: (((base) & _AC(0x00ffffff, ULL)) << 16) | \
  (((limit) & _AC(0x0000ffff, ULL))))
  -struct _kvm_segment {
  - __u64 base;
  - __u32 limit;
  - __u16 selector;
  - __u8 type;
  - __u8 present, dpl, db, s, l, g, avl;
  - __u8 unusable;
  - __u8 padding;
  -};
  -
  #define GDT_GET_G(x) (__u8)(((x) & 0x0080000000000000) >> 55)
  #define GDT_GET_DB(x) (__u8)(((x) & 0x0040000000000000) >> 54)
  #define GDT_GET_L(x) (__u8)(((x) & 0x0020000000000000) >> 53)
  