default-distrovars.inc: drop obsolete LGPLv2_WHITELIST_GPL-3.0
There doesn't seem to be a clear reason to have two separate
variables to hold whitelisted GPLv3 recipes. Both variables are
treated the same, so adding a recipe to LGPLv2_WHITELIST_GPL-3.0 is
already equivalent to adding it to WHITELIST_GPL-3.0.
Anyone needing to whitelist a GPLv3 recipe should now just use
WHITELIST_GPL-3.0.
Signed-off-by: Andre McCurdy <armccurdy@gmail.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
