Creating webrev under Windows/cygwin fails

[Patrick Reinhart]

Hi Magnus,

> This indicates that you have used another "hg" binary than the one provided by cygwin, e.g. from TortoiseHG. This is not recommended, and will in general fail in weird ways like this.
> 
> I recommend that you install mercurial from cygwin, and run hg clone with that instead. You can verify that your hg is correct by "which hg", it should be "/usr/bin/hg" or "/bin/hg", not a /cygdrive/c/... path. (Otherwise the order of cygwin binaries in the PATH is incorrect). Do not re-use the old repo cloned by the other hg.
> 
> /Magnus

Worked perfectly thanks very much.

Patrick