Update license docs for FSF new address and update gcrypt.texi.

Taken from:
https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
https://www.gnu.org/licenses/old-licenses/gpl-2.0.texi
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
https://www.gnu.org/licenses/old-licenses/lgpl-2.1.texi

• Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>