clang: Match Build targets for host and target clang
clang: Match Build targets for host and target clang

This is to help llvm-config detect settings correctly, without this mesa
fails to build with llvm-pipe

Fixes
|   File "/mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux/mesa/2_20.1.8-r0/recipe-sysroot-native/usr/lib/python3.8/site-packages/me
sonbuild/dependencies/dev.py", line 284, in _set_new_link_args
|     mode = self.get_config_value(['--shared-mode'], 'link_args')[0]
| IndexError: list index out of range

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

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