Merge pull request #3950 from rubygems/ruby_head_workarounds

Fix bundler daily CI

(cherry picked from commit 24f584c)

bundler/spec/commands/clean_spec.rb

@@ -626,7 +626,7 @@ def should_not_have_gems(*gems)
   end
 
   it "when using --force, it doesn't remove default gem binaries", :rubygems => ">= 3.2.0.rc.1" do
-    skip "does not work on Windows because it changes the path to look for default gems, and Windows uses the default fiddle gem" if Gem.win_platform?
+    skip "does not work on ruby 3.0 because it changes the path to look for default gems, tsort is a default gem there, and we can't install it either like we do with fiddle because it doesn't yet exist" unless RUBY_VERSION < "3.0.0"
 
     default_irb_version = ruby "gem 'irb', '< 999999'; require 'irb'; puts IRB::VERSION", :raise_on_error => false
     skip "irb isn't a default gem" if default_irb_version.empty?
@@ -638,6 +638,8 @@ def should_not_have_gems(*gems)
       end
     end
 
+    realworld_system_gems "fiddle"
+
     install_gemfile <<-G
       source "#{file_uri_for(gem_repo2)}"
     G