mintty issue with version 2.3.7

[Christoph Zimmermann <monochromec at gmail dot com>]

After the recent update to version 2.3.7 mintty prints the error message

Error: could not open log file: File exists.
: File exists <log file name>

every time I open a mintty window. I've tracked this down to the 
following snippet (around line # 228) in child.c:

   char * logf = newn(char, MAX_PATH + 1);
        strftime (logf, MAX_PATH, log, localtime (& now.tv_sec));
        free(log);
        log = logf;
      }

      log_fd = open(log, O_WRONLY | O_CREAT | O_EXCL, 0600);
      if (log_fd < 0) {
        // report message and filename:
        childerror("could not open log file", false);
        childerror(log, false);
      }

The culprit seems to be the open invocation with the combination of 
flags; possibly pointing to
a problem in the corresponding cygwin.dll implementation.

Please let me know if you need more details.

	Thanks, Chris

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