llvm-libunwind: Skip for mips/mips64
llvm-libunwind: Skip for mips/mips64

Not yet supported

Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

kraj/meta-clang,kraj/meta-clang,kraj/meta-clang