Use C stdio functions for score files and save files.

Switching from Unix file descriptor operations to C standard FILE*
functions will reduce portability problems.

arogue5/options.c

@@ -103,7 +103,7 @@ int get_score(char *optstr, WINDOW *win)
         return status;
     if (strcmp(old_score_file, optstr))
     {
-        md_reopen_score();
+        reopen_score();
     }
     return status;
 }