message: Pass compiler value through for Linux builds.
  Previously the compiler value was "compiler", while we were trying to
  special-case for values of "clang". Passing through the value from the
  cc_toolchain_config rule so our special-cases actually work.
diff: @@ -976,7 +976,7 @@ def _impl(ctx):
  toolchain_identifier = "local_linux"
  target_cpu = "local"
  target_libc = "local"
  - compiler = "compiler"
  + compiler = compiler
  action_configs = _action_configs(
  assembly_path = ctx.attr.host_compiler_path,
  c_compiler_path = ctx.attr.host_compiler_path,
  