Remove encoding magic comments

They are no longer needed since ruby 2.0.

lib/rubygems/package.rb

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # frozen_string_literal: true
 #--
 # Copyright (C) 2004 Mauricio Julio Fernández Pradier

lib/rubygems/package/tar_header.rb

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # frozen_string_literal: true
 #--
 # Copyright (C) 2004 Mauricio Julio Fernández Pradier

lib/rubygems/package/tar_reader.rb

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # frozen_string_literal: true
 #--
 # Copyright (C) 2004 Mauricio Julio Fernández Pradier

lib/rubygems/package/tar_reader/entry.rb

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # frozen_string_literal: true
 #++
 # Copyright (C) 2004 Mauricio Julio Fernández Pradier

lib/rubygems/package/tar_writer.rb

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # frozen_string_literal: true
 #--
 # Copyright (C) 2004 Mauricio Julio Fernández Pradier

test/rubygems/specifications/bar-0.0.2.gemspec

@@ -1,5 +1,3 @@
-# -*- encoding: utf-8 -*-
-
 Gem::Specification.new do |s|
   s.name          = "bar"
   s.version       = "0.0.2"

test/rubygems/specifications/rubyforge-0.0.1.gemspec

@@ -1,5 +1,3 @@
-# -*- encoding: utf-8 -*-
-
 Gem::Specification.new do |s|
   s.name              = "rubyforge"
   s.version           = "0.0.1"

test/rubygems/test_gem_commands_setup_command.rb

@@ -1,4 +1,3 @@
-# coding: UTF-8
 # frozen_string_literal: true
 
 require 'rubygems/test_case'

test/rubygems/test_gem_ext_ext_conf_builder.rb

@@ -1,4 +1,3 @@
-# coding: UTF-8
 # frozen_string_literal: true
 
 require 'rubygems/test_case'

test/rubygems/test_gem_package.rb

@@ -1,4 +1,3 @@
-# coding: utf-8
 # frozen_string_literal: true
 
 require 'rubygems/package/tar_test_case'

test/rubygems/test_gem_security_policy.rb

@@ -1,4 +1,3 @@
-# coding: utf-8
 # frozen_string_literal: true
 
 require 'rubygems/test_case'