dev-libs/beignet: enable LLVM7 support, switch to EAPI-7
LLVM7 support is provided by the backported upstream commit
e1b2419a0008e38ef2d9d255d9e9c74e9fba084b . It is described as
preliminary but the commit description elaborates this is simply because
LLVM7 was not released at the time. Fortunately it seems there have been
no breaking changes since the snapshot against which upstream tested
this and everything seems to be in order, in both 1.3 and 2.0 mode.
Signed-off-by: Marek Szuba <marecki@gentoo.org>
Package-Manager: Portage-2.3.62, Repoman-2.3.11