This require causes circular require.

```
$ touch empty_file

$ RUBYGEMS_GEMDEPS=empty_file ./local/bin/ruby -w -e ''
/home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92: warning: /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92: warning: loading in progress, circular require considered harmful - /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems.rb
	from <internal:gem_prelude>:1:in  `<internal:gem_prelude>'
	from <internal:gem_prelude>:1:in  `require'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems.rb:1417:in  `<top (required)>'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems.rb:1203:in  `use_gemdeps'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems/user_interaction.rb:47:in  `use_ui'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems.rb:1204:in  `block in use_gemdeps'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in  `require'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in  `require'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/bundler.rb:11:in  `<top (required)>'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/bundler.rb:11:in  `require_relative'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/bundler/rubygems_integration.rb:3:in  `<top (required)>'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in  `require'
	from /home/mame/work/ruby/local/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in  `require'
```

https://github.com/bundler/bundler/commit/c7c5bcea92

[Misc #16449][ruby-core:96458]

  Features:
    - Add caller information to some deprecation messages to make them easier to fix [#7361](https://github.com/bundler/bundler/pull/7361)
    - Reconcile `bundle cache` vs `bundle package` everywhere. Now in docs, CLI help and everywhere else `bundle cache` is the preferred version and `bundle package` remains as an alias [#7389](https://github.com/bundler/bundler/pull/7389)
    - Display some basic `bundler` documentation together with ruby's RDoc based documentation [#7394](https://github.com/bundler/bundler/pull/7394)

  Bugfixes:
    - Fix typos deprecation message and upgrading docs [#7374](https://github.com/bundler/bundler/pull/7374)
    - Deprecation warnings about `taint` usage on ruby 2.7 [#7385](https://github.com/bundler/bundler/pull/7385)
    - Fix `--help` flag not correctly delegating to `man` when used with command aliases [#7388](https://github.com/bundler/bundler/pull/7388)
    - `bundle add` should cache newly added gems if an application cache exists [#7393](https://github.com/bundler/bundler/pull/7393)
    - Stop using an insecure folder as a "fallback home" when user home is not defined [#7416](https://github.com/bundler/bundler/pull/7416)
    - Fix `bundler/inline` warning about `Bundler.root` redefinition [#7417](https://github.com/bundler/bundler/pull/7417)

7340: Fix bundle clean issue r=deivid-rodriguez a=deivid-rodriguez

### What was the end-user problem that led to this PR?

The problem was that `bundle clean` is crashing under some conditions.

### What was your diagnosis of the problem?

My diagnosis was that sometimes (when the bundle includes git sourced gems with extensions), it assumes that some paths exist, but they don't.

### What is your fix for the problem, implemented in this PR?

My fix is to ignore those paths.

### Why did you choose this fix out of the possible options?

I chose this fix because it fixes the issue.

Fixes #7338.

Co-authored-by: David Rodríguez <deivid.rodriguez@riseup.net>
(cherry picked from commit b007fde67c77c1f15f13b97eda186644c2a2be04)

https://github.com/bundler/bundler/commit/3766053507