[ruby-core:115762] [Ruby master Bug#20058] `warning: bigdecimal/util is found in bigdecimal` even if the gem spec has the `add_dependency "bigdecimal"` entry

Issue #20058 has been updated by segiddins (Samuel Giddins).


I also tried to fix with https://github.com/ruby/ruby/pull/9264

----------------------------------------
Bug #20058: `warning: bigdecimal/util is found in bigdecimal` even if the gem spec has the `add_dependency "bigdecimal"` entry
https://bugs.ruby-lang.org/issues/20058#change-105699

* Author: yahonda (Yasuo Honda)
* Status: Assigned
* Priority: Normal
* Assignee: mrkn (Kenta Murata)
* ruby -v: ruby 3.3.0dev (2023-12-08T11:25:04Z master cc9826503d) [x86_64-linux]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
`warning: bigdecimal/util is found in bigdecimal` warning since https://github.com/ruby/ruby/commit/cc9826503d989df877adbcd94d39a6ff78d0b785

### Steps to reproduce
- `foo.rb`
```
# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  gem "rails", github: "rails/rails", branch: "main"
end

require "active_support"
require "minitest/autorun" # https://github.com/minitest/minitest/commit/5f5c2111f36658fd2636b108b8327ce4b2f3cf8d will resolve `warning: mutex_m was loaded from the standard library,`

# This require will raise `warning: bigdecimal/util is found in bigdecimal`
require "bigdecimal/util"
```

### Expected behavior

No `warning: bigdecimal/util is found in bigdecimal, which will no longer be part of the default gems since Ruby 3.4.0. Add bigdecimal to your Gemfile or gemspec.` warnings because Rails has already has `add_dependency "bigdecimal"`
https://github.com/rails/rails/blob/main/activesupport/activesupport.gemspec#L44

### Actual behavior

`warning: bigdecimal/util is found in bigdecimal, which will no longer be part of the default gems since Ruby 3.4.0. Add bigdecimal to your Gemfile or gemspec.` appears.

Note: `warning: mutex_m was loaded from the standard library, but will no longer be part of the default gems since Ruby 3.4.0. Add mutex_m to your Gemfile or gemspec.` will be addressed by minitest.


```
$ ruby -v ; ruby foo.rb
ruby 3.3.0dev (2023-12-08T11:25:04Z master cc9826503d) [x86_64-linux]
Fetching https://github.com/rails/rails.git
Resolving dependencies...
Fetching gem metadata from https://rubygems.org/..........
/home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/bundler/gems/rails-89d8569abe25/activesupport/lib/active_support/core_ext/big_decimal/conversions.rb:4: warning: bigdecimal/util is found in bigdecimal, which will no longer be part of the default gems since Ruby 3.4.0. Add bigdecimal to your Gemfile or gemspec.
/home/yahonda/.rbenv/versions/trunk/lib/ruby/gems/3.3.0+0/gems/minitest-5.20.0/lib/minitest.rb:3: warning: mutex_m was loaded from the standard library, but will no longer be part of the default gems since Ruby 3.4.0. Add mutex_m to your Gemfile or gemspec.
Run options: --seed 37509

# Running:



Finished in 0.001073s, 0.0000 runs/s, 0.0000 assertions/s.
0 runs, 0 assertions, 0 failures, 0 errors, 0 skips
$
```



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