Description of problem:

"bundle install --path=vendor/bundle" with the Gemfile fails to install "nio4r"
showing the error message "did_you_mean (LoadError)", using RPM ruby (ruby-2.7.0-127.fc32.x86_64).

rubygem-did_you_mean RPM is installed to the system.

In case of rubygem-did_you_mean RPM, did_you_mean is a normal gem, as you know.

```
$ gem list did_you_mean

*** LOCAL GEMS ***

did_you_mean (1.4.0)
```

In case of upstream Ruby 2.7.0's did_you_mean, did_you_mean is a default gem. And this issue does not happen with the upstream Ruby.

```
$ gem list did_you_mean

*** LOCAL GEMS ***

did_you_mean (default: 1.4.0)
```


Version-Release number of selected component (if applicable):

* Fedora rawhide
* ruby-2.7.0-127.fc32.x86_64
* ruby-devel-2.7.0-127.fc32.x86_64
* rubygem-bundler-2.1.2-127.fc32.noarch
* rubygem-did_you_mean-1.4.0-127.fc32.noarch


How reproducible:

Steps to Reproduce:
1. Prepare following `Gemfile`.

```
$ cat Gemfile 
source "https://rubygems.org"

gem "nio4r", "= 2.5.2"
```


2. Run following command.

```
$ bundle install --path=vendor/bundle
```

Actual results:

```
$ bundle install --path=vendor/bundle
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Using bundler 2.1.2
Fetching nio4r 2.5.2
Installing nio4r 2.5.2 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /builddir/work/vendor/bundle/ruby/2.7.0/gems/nio4r-2.5.2/ext/nio4r
/usr/bin/ruby -I /usr/share/rubygems -r ./siteconf20200325-523-11don1e.rb extconf.rb
/usr/share/rubygems/rubygems/core_ext/kernel_require.rb:92:in `require': cannot load such file
-- did_you_mean (LoadError)
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:92:in `require'
	from <internal:gem_prelude>:2:in `<internal:gem_prelude>'

extconf failed, exit code 1

Gem files will remain installed in /builddir/work/vendor/bundle/ruby/2.7.0/gems/nio4r-2.5.2
for inspection.
Results logged to
/builddir/work/vendor/bundle/ruby/2.7.0/extensions/x86_64-linux/2.7.0/nio4r-2.5.2/gem_make.out

An error occurred while installing nio4r (2.5.2), and Bundler cannot continue.
Make sure that `gem install nio4r -v '2.5.2' --source 'https://rubygems.org/'` succeeds before
bundling.

In Gemfile:
  nio4r
```


Expected results:

```
$ bundle install --path=vendor/bundle
```

installs nio4r successfully.


Additional info:

rubygems RPM's gem command succeeds to install nio4r like this on Fedora rawhide.

```
# gem instal nio4r
Building native extensions. This could take a while...
Successfully installed nio4r-2.5.2
Parsing documentation for nio4r-2.5.2
Done installing documentation for nio4r after 0 seconds
1 gem installed
```

So, I assume this is a Bundler specific issue.