Fixes the following configure error:
configure:23490: error: radeonsi and r600g require libelf when using LLVM
(From OE-Core rev: 43e7f168c84128b5d48bbfde9d6c07f2fb656b00)
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>