fix: avoid breaking Bazel 5 users

Related to #584 which removed a Bazel 5 workaround

docs/BUILD.bazel

@@ -116,10 +116,12 @@ stardoc_with_diff_test(
  bzl_library_target = "//lib:host_repo",
 )
 
-stardoc_with_diff_test(
- name = "platform_utils",
- bzl_library_target = "//lib:platform_utils",
-)
+# NB: we don't bother documenting this, because it just has three trivial functions,
+# and the dependency on @local_config_platform makes the load() break for Bazel 5 users.
+# stardoc_with_diff_test(
+# name = "platform_utils",
+# bzl_library_target = "//lib:platform_utils",
+# )
 
 stardoc_with_diff_test(
  name = "stamping",

lib/BUILD.bazel

@@ -5,6 +5,8 @@ load("//lib/private:copy_common.bzl", "copy_options")
 load("//lib/private:stamping.bzl", "stamp_build_setting")
 
 # Ensure that users building their own rules can dep on our bzl_library targets for their stardoc
+# This file has a dependency on @local_config_platform which is breaking for Bazel 5 users.
+# gazelle:exclude platform_utils.bzl
 package(default_visibility = ["//visibility:public"])
 
 exports_files(
@@ -277,12 +279,6 @@ bzl_library(
  ],
 )
 
-bzl_library(
- name = "platform_utils",
- srcs = ["platform_utils.bzl"],
- deps = ["//lib/private:platform_utils"],
-)
-
 bzl_library(
  name = "base64",
  srcs = ["base64.bzl"],

lib/private/BUILD.bazel

@@ -1,5 +1,7 @@
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 
+# This file has a dependency on @local_config_platform which is breaking for Bazel 5 users.
+# gazelle:exclude platform_utils.bzl
 exports_files(
  [
  "diff_test_tmpl.sh",
@@ -250,16 +252,6 @@ bzl_library(
  deps = [":repo_utils"],
 )
 
-bzl_library(
- name = "platform_utils",
- srcs = [
- "platform_utils.bzl",
- "@local_config_platform//:constraints.bzl", # keep
- ],
- visibility = ["//lib:__subpackages__"],
- deps = [], # keep
-)
-
 bzl_library(
  name = "tar_toolchain",
  srcs = ["tar_toolchain.bzl"],