Fix curlrc existence check

Enumerable#one? is not available under Ruby 1.8.6. Further, we really
want #any? here, as setting both HOME and CURL_HOME can trigger a false
negative.

Fixes Homebrew/homebrew#15883.

Library/Homebrew/cmd/doctor.rb

@@ -484,7 +484,7 @@ def check_user_path_3
 end
 
 def check_user_curlrc
-  if %w[CURL_HOME HOME].one?{|key| ENV[key] and File.exists? "#{ENV[key]}/.curlrc" } then <<-EOS.undent
+  if %w[CURL_HOME HOME].any?{|key| ENV[key] and File.exists? "#{ENV[key]}/.curlrc" } then <<-EOS.undent
     You have a curlrc file
     If you have trouble downloading packages with Homebrew, then maybe this
     is the problem? If the following command doesn't work, then try removing