Only .m4 macros are included in this recipe so the correct license is FSF-Unlimited
as specified in those marcros, not the main gettext license. This patch corrects
that mistake.
(From OE-Core rev: 25dc5af38230fdf5891597c07c4f96c633001006)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>