This was needed to use provide different llvm from meta-clang or other
layers, seems unused since meta-clang has stopped providing a versioned
llvm
(From OE-Core rev: 7012aefb10a4101b2f3baf4dc20c64e3260b4cc8)
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>