Where a user adds "GPLv3" to INCOMPATIBLE_LICENSE they almost certainly
mean both GPLv3-only and GPLv3-or-later. Update the code to handle this
correctly.
(From OE-Core rev: 08cbf17485b6443a6118acfac8200eb6c61445a3)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>