GitLab

  (utc_base): Declare as ULONGLONG, not long double.
  (convert_time_raw): Delete.
  (FILETIME_TO_U64, U64_TO_LISP_TIME): New macros.
  (initialize_utc_base): New function.
  (convert_time): Use FILETIME_TO_U64, initialize_utc_base.
  (convert_from_time_t): Use initialize_utc_base; compute result with
  64-bit arithmetic.
  (process_times): Use FILETIME_TO_U64, U64_TO_LISP_TIME.