The 'You should have received a copy ... write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA' paragraph flags the lintian tag
'old-fsf-address-in-copyright-file'. Debian prefers either no
address at all or an https://www.gnu.org/licenses/ reference;
in this file /usr/share/common-licenses/LGPL-2.1 is already
cited a few lines below, so the address is redundant. Replace
with the gnu.org URL per current FSF boilerplate.
Pre-existing text, no change to the licence terms.
Signed-off-by: Markus Fritsche <fritsche.markus@gmail.com>