Fix bugs in update-game-score, on MS-Windows and elsewhere.
lib-src/update-game-score.c (read_score): Try reading a character before probing the stream for EOF. Initialize score->score to zero, before reading and accumulating the score. (read_scores): Fix logic that determines which value to return. Close the input stream when finished reading the scores (avoids failures in overwriting the file with a new one on MS-Windows, since a file that is open cannot be deleted). lib-src/ntlib.h (rename): Don't undefine. lib-src/ntlib.c (sys_rename): New function, needed for update-game-score.
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