Merge pull request #17268 from Homebrew/revert-6464-master

Revert "Create '.keepme' files in directories"

Library/Homebrew/install.rb

@@ -327,12 +327,6 @@ module Homebrew
       def attempt_directory_creation
         Keg::MUST_EXIST_DIRECTORIES.each do |dir|
           FileUtils.mkdir_p(dir) unless dir.exist?
-
-          # Create these files to ensure that these directories aren't removed
-          # by the Catalina installer.
-          # (https://github.com/Homebrew/brew/issues/6263)
-          keep_file = dir/".keepme"
-          FileUtils.touch(keep_file) unless keep_file.exist?
         rescue
           nil
         end