clang.bbclass: Set nativesk ldso location correctly during link
clang.bbclass: Set nativesk ldso location correctly during link

Add aarch64 host support
Enable lld via LDFLGS instead of TOOLCHAIN_FLAGS which also get passed
to compiler
Add relative rpaths so the liraries from SDK sysroot are preferred over
sdk host when SDK is used

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

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