chromium: Make BUILD_AR be llvm-ar when using clang.
chromium: Make BUILD_AR be llvm-ar when using clang.

This follows what upstream does as well. There are not a lot of files that
need to be linked in the host system, but nonetheless it is good to be on
the safe side and use LLVM's ar rather than relying on the binutils one.

Signed-off-by: Raphael Kubo da Costa <5fe4d20cf6ab8a2cf4e5e71d4c2d58346e96df0d@intel.com>

webdino/meta-browser,OSSystems/meta-browser,webdino/meta-browser,webdino/meta-browser,schnitzeltony/meta-browser,schnitzeltony/meta-browser,webdino/meta-browser,schnitzeltony/meta-browser,webdino/meta-browser,OSSystems/meta-browser,schnitzeltony/meta-browser,OSSystems/meta-browser,OSSystems/meta-browser