Bug#271212: @euro support missing for Ireland

[Petter Reinholdtsen <pere@hungry.com>]

[Christian Perrier]
> So, basically, I still have to understand why we still need these
> @euro variants..:-). Their only purpose is indeed being associated
> later with a ISO-8859-15 charset while non @euro locales are often
> associated with ISO-8859-1 (which is pure inconsistency because the
> charset does NOT contain the currency symbol defined by the
> locale....)

The locales using the EURO char _need_ to use the @euro variant.  The
reason is that the entry in /usr/share/i18n/SUPPORTED without the
@euro modifier is not using the ISO-8859-15 charset.

So, to get a locale with the proper supported locale/charset
combination, one need to use the ll_CC@euro variant.