llvm-config no longer links with libLLVM, so there is no need
to install it in -native (and it isn't built in the first place).
This also significantly speeds up llvm-native build.
(From OE-Core rev: ee06fc2a19665461e143fe3bf7e94b703652e1cf)
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>