relicensing the core library to "LGPLv3+ or GPLv2+ dual" ?

For now the LICENSE file says:

  Since GnuTLS version 3.1.10, the core library is released under
  the GNU Lesser General Public License (LGPL) version 2.1 or later
  (see doc/COPYING.LESSER for the license terms).

but later on:

  Note, however, that the nettle and the gmp libraries which are
  GnuTLS dependencies, they are distributed under a LGPLv3+ or GPLv2+ dual
  license. As such binaries linking to them need to adhere to either LGPLv3+
  or the GPLv2+ license.

I'm wondering if it would cause any problem to explicitly license the
core library as a LGPLv3+ or GPLv2+ dual license.  Does anyone know of
any use-case where LGPLv2 is required?

Regards,
-- 
Daiki Ueno