libglade: Update LICENSE field version to LGPLv2
libglade: Update LICENSE field version to LGPLv2

* Updated LICENSE field version from generic LGPL to LGPLv2 and
  LGPLv2+ to reflect the real license version.
* This change was back-ported from oe-core.

Signed-off-by: Chase Maupin <5a5662f468a76e0fc4391e65fb9f536df44d7380@ti.com>

mrchapp/arago-oe-dev,mrchapp/arago-oe-dev,mrchapp/arago-oe-dev,mrchapp/arago-oe-dev,sledz/oe,sledz/oe,sledz/oe,sledz/oe,mrchapp/arago-oe-dev,sledz/oe,mrchapp/arago-oe-dev,sledz/oe,mrchapp/arago-oe-dev,sledz/oe