brew: remove sudo call

Closes #5865

Library/Homebrew/brew.rb

@@ -113,13 +113,9 @@ begin
 
     odie "Unknown command: #{cmd}" if !possible_tap || possible_tap.installed?
 
-    brew_uid = HOMEBREW_BREW_FILE.stat.uid
-    tap_commands = []
-    tap_commands += %W[/usr/bin/sudo -u ##{brew_uid}] if Process.uid.zero? && !brew_uid.zero?
     # Unset HOMEBREW_HELP to avoid confusing the tap
     ENV.delete("HOMEBREW_HELP") if help_flag
-    tap_commands += %W[#{HOMEBREW_BREW_FILE} tap #{possible_tap}]
-    safe_system(*tap_commands)
+    safe_system HOMEBREW_BREW_FILE, "tap", possible_tap.name
     ENV["HOMEBREW_HELP"] = "1" if help_flag
     exec HOMEBREW_BREW_FILE, cmd, *ARGV
   end