One of the engineers used the --local_clang_compiler flag where the setup failed. This was due to not displaying the requirements ahead of time that lld is need it also

Furthermore, the path of lld is a symlink and we should be reading the realpath of it. Bazel repository_ctx.path(lld_path).exist did not detect that the path exists.

The error message of not finding the installed lld needs to be updated as it prints the following: "The LLD_PATH does not exist: xx/yy/zz". LLD_PATH was an environment variable and we are no longer using it.