remove Homebrew namespaces in homebrew-fork

* remove two Homebrew modules
* rename Homebrew.system
* rename HomebrewArgvExtension
* remove some unused requires

still todo: constants starting with HOMEBREW_

lib/homebrew-fork/Library/Homebrew/extend/ARGV.rb

@@ -1,4 +1,4 @@
-module HomebrewArgvExtension
+module HomebrewForkArgvExtension
   def verbose?
     flag? '--verbose' or !ENV['VERBOSE'].nil? or !ENV['HOMEBREW_VERBOSE'].nil?
   end

lib/homebrew-fork/Library/Homebrew/global.rb

@@ -1,12 +1,9 @@
 require 'extend/pathname'
 require 'extend/ARGV'
 require 'extend/string'
-require 'utils'
 require 'exceptions'
-require 'set'
-require 'rbconfig'
 
-ARGV.extend(HomebrewArgvExtension)
+ARGV.extend(HomebrewForkArgvExtension)
 
 def cache
   if ENV['HOMEBREW_CACHE']
@@ -50,10 +47,3 @@ HOMEBREW_GITHUB_API_TOKEN = ENV["HOMEBREW_GITHUB_API_TOKEN"]
 HOMEBREW_USER_AGENT = "Homebrew-cask v0.51+ (Ruby #{RUBY_VERSION}-#{RUBY_PATCHLEVEL}; #{MACOS_VERSION})"
 
 HOMEBREW_CURL_ARGS = '-f#LA'
-
-module Homebrew
-  extend self
-
-  attr_accessor :failed
-  alias_method :failed?, :failed
-end

lib/homebrew-fork/Library/Homebrew/test/testing_env.rb

@@ -28,4 +28,4 @@ MACOS_VERSION = ENV.fetch('MACOS_VERSION') { MACOS_FULL_VERSION[/10\.\d+/] }
 
 # required for many tests
 # eg: undefined method `verbose?' for []:Array
-ARGV.extend(HomebrewArgvExtension)
+ARGV.extend(HomebrewForkArgvExtension)

lib/homebrew-fork/Library/Homebrew/utils.rb

@@ -59,28 +59,26 @@ end
 
 # :stopdoc:
 
-module Homebrew
-  def self.system cmd, *args
-    puts "#{cmd} #{args*' '}" if ARGV.verbose?
-    pid = fork do
-      yield if block_given?
-      args.collect!{|arg| arg.to_s}
-      exec(cmd, *args) rescue nil
-      exit! 1 # never gets here unless exec failed
-    end
-    Process.wait(pid)
-    $?.success?
+def homebrew_fork_system cmd, *args
+  puts "#{cmd} #{args*' '}" if ARGV.verbose?
+  pid = fork do
+    yield if block_given?
+    args.collect!{|arg| arg.to_s}
+    exec(cmd, *args) rescue nil
+    exit! 1 # never gets here unless exec failed
   end
+  Process.wait(pid)
+  $?.success?
 end
 
 # Kernel.system but with exceptions
 def safe_system cmd, *args
-  Homebrew.system(cmd, *args) or raise ErrorDuringExecution.new(cmd, args)
+  homebrew_fork_system(cmd, *args) or raise ErrorDuringExecution.new(cmd, args)
 end
 
 # prints no output
 def quiet_system cmd, *args
-  Homebrew.system(cmd, *args) do
+  homebrew_fork_system(cmd, *args) do
     # Redirect output streams to `/dev/null` instead of closing as some programs
     # will fail to execute if they can't write to an open stream.
     $stdout.reopen('/dev/null')