gpgme: Fix license

gpgme: Fix license

gpgme license is wrong since the addition of the package in commit
https://git.openwrt.org/?p=feed/packages.git;a=commit;h=3e39633b75e7d26f3666bce9c2e97d268f0fd068

Indeed, gpgme has been licensed under LPGL-2.1+ since version 1.0.2 back
in 2004 [1]:

Noteworthy changes in version 1.0.2 (2004-12-28)
------------------------------------------------

 * Changed the license of the library to the GNU Lesser General Public
   License (LGPL), version 2.1 or later.

[1]: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gpgme.git;a=blob;f=NEWS;h=2475a877a40817f575accd22a386bfd5f0a66aad;hb=HEAD

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>