This reverts commit 0fe82ae087130d7f360cc0607be93995cedbdb16.

This reverts commit 2923f42ed7622f6310c63aab4c0abf05402f9a04.

https://github.com/ruby/actions/actions/runs/12108034481/job/33755653615#step:23:1031

```
/home/runner/work/actions/actions/snapshot-master/lib/rdoc/code_object.rb:322:in 'RDoc::CodeObject#parent': undefined method 'find_class_or_module' for nil (NoMethodError)
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/code_object/class_module.rb:342:in 'RDoc::ClassModule#marshal_dump'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/store.rb:878:in 'Marshal.dump'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/store.rb:878:in 'block in RDoc::Store#save_class'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/store.rb:877:in 'IO.open'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/store.rb:877:in 'RDoc::Store#save_class'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/store.rb:763:in 'block in RDoc::Store#save'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/store.rb:762:in 'Array#each'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/store.rb:762:in 'RDoc::Store#save'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/generator/ri.rb:27:in 'RDoc::Generator::RI#generate'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/rdoc.rb:528:in 'block in RDoc::RDoc#generate'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/rdoc.rb:522:in 'Dir.chdir'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/rdoc.rb:522:in 'RDoc::RDoc#generate'
	from /home/runner/work/actions/actions/snapshot-master/lib/rdoc/rdoc.rb:501:in 'RDoc::RDoc#document'
	from ./tool/rdoc-srcdir:27:in '<main>'
```

(https://github.com/ruby/rdoc/pull/1217)

If a NormalClass's superclass is a C enclosure, then update the
superclass to point to the RDoc::NormalClass.

This is done in a single pass after all files have been parsed.

Fixes https://github.com/ruby/rdoc/pull/1205.

https://github.com/ruby/rdoc/commit/1ecd9581b1

https://github.com/ruby/rdoc/commit/e21dfccb4a

https://github.com/ruby/rdoc/commit/da7a0c7553

https://github.com/ruby/rdoc/commit/e4c90340d0

https://github.com/ruby/rdoc/commit/135198a31c

https://github.com/ruby/rdoc/commit/41db49c485

* Support XDG_CONFIG_HOME for gemrc.

* Support XDG_DATA_HOME for .gem

* Added test for XDG_DATA_HOME

* Do not reuse environmental variable.

* Unify .rdoc path to RDoc.home.

* Support XDG_DATA_HOME for .rdoc

* Ignore exists?

* Extracted config_home path

* Use XDG_CONFIG_HOME for default credential path

* Fixed inconsistency location.

* Fixed the broken tests.

* Support XDG_CONFIG_HOME for irbrc

* Introduce Gem.cache_home as XDG_CACHE_HOME

* Use Gem.cache_home instead of Gem.config_home for the credential file of RubyGems.

* Initialized the old configurations

* Fixed test failure related the configuration initialization

* restore XDG_DATA_HOME

* Fixed the broken examples of bundler with XDG_*

* Do not modify environmental variable on test file

* Use XDG_DATA_HOME insted of XDG_CACHE_HOME for credential file

* stub out Gem.data_home

* Move dir accessor to defaults.rb file

* Use XDG_DATA_HOME for signed gem features

* Use XDG_DATA_HOME for spec cache

* Do not rely on Gem.user_home

* Gem.user_home is always exists. Don't need to use FileUitls.mkdir_p

* Bump support version to RubyGems 3.2.0+

* Removed the needless fallback configuration

* Fixed the inconsistency methods that are find_config_file and config_file

* Use Gem.configuration.credentials_path instead of hard-coded path

* gem_path is always provided

* Removed the duplicated code of find_home

* Also removed the duplicated code of user_home

* use Gem::UNTAINT instead of untaint for surpressing the warnings

* Use File.directory

* Restore XDG_DATA_HOME

* Use File.write