LICENSES: Replace the obsolete address of the FSF in the LGPL-2.1

The FSF does not reside in the Franklin street anymore. Let's update
the address with the link to their website, as suggested in the latest
revisions of their LGPL-2.1 license:
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: huth

LICENSES/preferred/LGPL-2.1

@@ -18,7 +18,7 @@ GNU LESSER GENERAL PUBLIC LICENSE
 Version 2.1, February 1999
 
 Copyright (C) 1991, 1999 Free Software Foundation, Inc.
-51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+<https://fsf.org/>
 
 Everyone is permitted to copy and distribute verbatim copies of this
 license document, but changing it is not allowed.
@@ -488,9 +488,9 @@ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
 for more details.
 
 You should have received a copy of the GNU Lesser General Public License
-along with this library; if not, write to the Free Software Foundation,
-Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add
-information on how to contact you by electronic and paper mail.
+along with this library; if not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
 
 You should also get your employer (if you work as a programmer) or your
 school, if any, to sign a "copyright disclaimer" for the library, if