Ruby

[bundler/bundler] Do require "rubygems" only when needed

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'

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