The old test for EUC-KR was copied from the first web page that I could
find that was encoded in EUC-KR; the new one is the first line of
golang.org/x/text/internal/testtext.Korean.

Change-Id: I3de076256c935088a06138056cde216190766a6d
Reviewed-on: https://go-review.googlesource.com/18063Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>