kernel32: Add LCMapStringEx implementation and test it reusing tests from LCMapStringW

[Dmitry Timoshkov]

André Hentschel <nerv at dawncrow.de> wrote:

> +/* Locale name special values */
> +#define LOCALE_NAME_INVARIANT       L""
> +#define LOCALE_NAME_MAX_LENGTH      85
> +#define LOCALE_NAME_SYSTEM_DEFAULT  L"!sys-default-locale"
> +#define LOCALE_NAME_USER_DEFAULT    NULL

Have a look how unicode constants are defined in other header files,
the above version can't work in Wine.

Also just duplicating LCMapString tests is not a very good idea, it would be
better to find a way to share the test data.

-- 
Dmitry.