Virtual machine tools states enumeration

typedef enum _PRL_VM_TOOLS_STATE {
  PTS_UNKNOWN = 0x0,
  PTS_POSSIBLY_INSTALLED = PTS_UNKNOWN,
  PTS_NOT_INSTALLED = 0x1,
  PTS_INSTALLED = 0x2,
  PTS_OUTDATED = 0x3
} PRL_VM_TOOLS_STATE;