logerrit date: unknown option -- v

[Ilmari Lauhakangas]

On 14.3.2021 18.45, Regina Henschel wrote:
> Hi all,
> 
> after
>   ./logerrit submit master
> I get the message
>   date: unknown option -- v
> 
> Submit was successful nevertheless.

These commits added a condition to not submit, if the parent commit is 
older than 1 week:
https://git.libreoffice.org/core/commit/e7a471a8fbac22877973af7e7be8c6a0701b4046
https://git.libreoffice.org/core/commit/69959235c3094b811406f734e863a63fc61046c0

but it seems Cygwin's uname string needs to be taken into account.

Ilmari