Fix symbols loading for Bazel v9

Author: oxidase

toolchain/config.bzl

@@ -1,5 +1,7 @@
 load("@bazel_tools//tools/build_defs/cc:action_names.bzl", "ACTION_NAMES")
 load("@rules_cc//cc:cc_toolchain_config_lib.bzl", "action_config", "feature", "flag_group", "flag_set")
+load("@rules_cc//cc/toolchains:cc_toolchain_config_info.bzl", "CcToolchainConfigInfo")
+load("@rules_cc//cc/common:cc_info.bzl", "CcInfo")
 
 def _tool_path(bins, toolchain_prefix, tool_name):
     """Generate tool paths for GCC"""