ansible: remove arg filtering hack

Formula/ansible.rb

@@ -52,12 +52,6 @@ class Ansible < Formula
     ENV.prepend_create_path 'PYTHONPATH', prefix+'lib/python2.7/site-packages'
     install_args = [ "setup.py", "install", "--prefix=#{libexec}" ]
 
-    # pycrypto's C bindings use flags unrecognized by clang,
-    # but since it doesn't use a makefile arg refurbishment
-    # is normally not enabled.
-    # See https://github.com/Homebrew/homebrew/issues/27639
-    ENV.append 'HOMEBREW_CCCFG', 'O'
-
     resource('pycrypto').stage { system "python", *install_args }
     resource('pyyaml').stage { system "python", *install_args }
     resource('paramiko').stage { system "python", *install_args }