sys-libs/timezone-data: remove old URL from HOMEPAGE metadata

sys-libs/timezone-data: remove old URL from HOMEPAGE metadata

The ebuild contains a reference to http://www.twinsun.com/tz/tz-link.htm,
which now leads to a 404.

This just removes the URL from the HOMEPAGE variable in the ebuild,
as it is the only place in the ebuild where this URL or domain exist.

Closes: https://bugs.gentoo.org/674738
Signed-off-by: Timothy Mason <masonts@gmail.com>
Package-Manager: Portage-2.3.51, Repoman-2.3.11
Closes: https://github.com/gentoo/gentoo/pull/10761
Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>