pop3: Small consistency tidy up

                             have been received so far */

  size_t strip;           /* Number of bytes from the start to ignore as

                             non-body */

  unsigned int authtypes; /* Supported authentication types */

  unsigned int authtypes; /* Accepted authentication types */

  unsigned int authmechs; /* Accepted SASL authentication mechanisms */

  unsigned int preftype;  /* Preferred authentication type */

  unsigned int prefmech;  /* Preferred SASL authentication mechanism */