[rubygems/rubygems] remove unused files in cargo builder test fixtures

https://github.com/rubygems/rubygems/commit/233847513b

test/rubygems/test_gem_ext_cargo_builder/custom_name/build.rb

@@ -1,21 +0,0 @@
-if ENV["RUBYOPT"] || defined? Gem
-  ENV.delete "RUBYOPT"
-
-  require "rbconfig"
-  cmd = [RbConfig.ruby, "--disable-gems", "build.rb", *ARGV]
-
-  exec(*cmd)
-end
-
-require "tmpdir"
-
-lp = File.expand_path("../../../../lib", __dir__)
-gem = ["ruby", "-I#{lp}", File.expand_path("../../../../bin/gem", __dir__)]
-gemspec = File.expand_path("custom_name.gemspec", __dir__)
-
-Dir.mktmpdir("custom_name") do |dir|
-  built_gem = File.expand_path(File.join(dir, "custom_name.gem"))
-  system(*gem, "build", gemspec, "--output", built_gem)
-  system(*gem, "install", "--verbose", "--local", built_gem, *ARGV)
-  system %q(ruby -rcustom_name -e "puts 'Result: ' + CustomName.say_hello")
-end

test/rubygems/test_gem_ext_cargo_builder/rust_ruby_example/build.rb

@@ -1,21 +0,0 @@
-if ENV["RUBYOPT"] || defined? Gem
-  ENV.delete "RUBYOPT"
-
-  require "rbconfig"
-  cmd = [RbConfig.ruby, "--disable-gems", "build.rb", *ARGV]
-
-  exec(*cmd)
-end
-
-require "tmpdir"
-
-lp = File.expand_path("../../../../lib", __dir__)
-gem = ["ruby", "-I#{lp}", File.expand_path("../../../../bin/gem", __dir__)]
-gemspec = File.expand_path("rust_ruby_example.gemspec", __dir__)
-
-Dir.mktmpdir("rust_ruby_example") do |dir|
-  built_gem = File.expand_path(File.join(dir, "rust_ruby_example.gem"))
-  system(*gem, "build", gemspec, "--output", built_gem)
-  system(*gem, "install", "--verbose", "--local", built_gem, *ARGV)
-  system %q(ruby -rrust_ruby_example -e "puts 'Result: ' + RustRubyExample.reverse('hello world')")
-end