lisa._kmod: Give priority to bare "clang" over "clang-XYZ"

FIX

If the version of the bare "clang" binary as reported by "clang --version" is equally good, give priority to it over a "clang-XYZ" binary. This improves compatibility with setups that use an unversioned name like GKI prebuilt toolchains, or other custom builds available in PATH that would not have bothered giving clang a special name.