Perform several small cleanups to the utmpx code.

- Massively reduce BSS usage. Let futx_to_utx() dynamically allocate the
  structure. There is only a very small amount of applications out there
  that needs to use the utmpx database. Wasting 1 KB on unused
  structures makes little sense.

- Just let getutxid() search for matching ut_id's for any *PROCESS-type.
  This makes the code a bit more future-proof.

- Fix a POSIX-mistake: when reading POSIX and the OpenSolaris
  implementation, getutxline() must return USER_PROCESS and
  LOGIN_PROCESS records whose ut_lines match. When reading POSIX, it
  seems LOGIN_PROCESS should not use ut_line at the first place. I have
  reported this issue.

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