Fix miscellaneous update-game-score bugs.
* configure.ac (difftime): Remove. * lib/update-game-score.c (difftime) [!HAVE_DIFFTIME]: Remove. (read_score) [HAVE_GETDELIM]: Don't access uninitialized storage. (read_scores, write_scores): Check for fclose failure. (write_scores): Use fchmod, not chmod, to avoid a race. (lock_file): Fix test for out-of-date lock file; it was reversed. Use ordinary subtraction rather than difftime; since we're already assuming POSIX we don't need to worry about the possibility of time_t being a magic cookie.
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