Code review comment for lp:~fgallaire/bzr/fix-gmtime-lite

Richard, I didn't notice this in the operation of bzr as I don't use Windows, but you can easily test it.

This is the bug mentioned in the code, I have already fixed it in Mercurial:
https://www.mercurial-scm.org/repo/hg/rev/87c6ad2251d8