[rubygems/rubygems] Add missing require 'fileutils' in `Gem::Config…

…File`

rubygems/rubygems@c4004fadd9

lib/rubygems/config_file.rb

@@ -320,7 +320,8 @@ def set_api_key(host, api_key)
     config = load_file(credentials_path).merge(host => api_key)
 
     dirname = File.dirname credentials_path
-    FileUtils.mkdir_p(dirname) unless File.exist? dirname
+    require 'fileutils'
+    FileUtils.mkdir_p(dirname)
 
     Gem.load_yaml
 
@@ -457,9 +458,8 @@ def to_yaml # :nodoc:
 
   # Writes out this config file, replacing its source.
   def write
-    unless File.exist?(File.dirname(config_file_name))
-      FileUtils.mkdir_p File.dirname(config_file_name)
-    end
+    require 'fileutils'
+    FileUtils.mkdir_p File.dirname(config_file_name)
 
     File.open config_file_name, 'w' do |io|
       io.write to_yaml