Remove some unneeded requires.

Library/Homebrew/extend/os/linux/system_config.rb

@@ -1,7 +1,6 @@
 # typed: true
 # frozen_string_literal: true
 
-require "formula"
 require "os/linux/glibc"
 require "system_command"
 
@@ -48,7 +47,7 @@ module SystemConfig
       out.puts "/usr/bin/gcc: #{host_gcc_version}"
       out.puts "/usr/bin/ruby: #{host_ruby_version}" if RUBY_PATH != HOST_RUBY_PATH
       ["glibc", "gcc", "xorg"].each do |f|
-        out.puts "#{f}: #{formula_linked_version f}"
+        out.puts "#{f}: #{formula_linked_version(f)}"
       end
     end
   end

Library/Homebrew/uninstall.rb

@@ -2,7 +2,6 @@
 # frozen_string_literal: true
 
 require "keg"
-require "formula"
 
 module Homebrew
   # Helper module for uninstalling kegs.