Reimplement EnumDateFormats, make it work for all available locales

[Paul Vriens]

> Hello,
>
> Changelog:
>     Dmitry Timoshkov <dmitry at codeweavers.com>
>     - Reimplement EnumDateFormats, make it work for all available locales.
>     - Add a test for EnumDateFormats
>
...
> -BOOL WINAPI EnumDateFormatsA( DATEFMT_ENUMPROCA lpDateFmtEnumProc, LCID
> Locale,  DWORD dwFlags)
> +BOOL WINAPI EnumDateFormatsA(DATEFMT_ENUMPROCA proc, LCID lcid, DWORD
> flags)

Why did you change the names ? I thought we sticked to the MSDN ones ?

Paul.