- Add rsa-use-system-setuptools.patch

- Update to version 3.1.1:

OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-rsa?expand=0&rev=5

python-rsa.spec

@@ -1,7 +1,7 @@
 #
 # spec file for package python-rsa
 #
-# Copyright (c) 2012 SUSE LINUX Products GmbH, Nuernberg, Germany.
+# Copyright (c) 2013 SUSE LINUX Products GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -24,6 +24,7 @@ Summary:        Pure-Python RSA Implementation
 License:        Apache-2.0
 Group:          Development/Languages/Python
 Source:         http://pypi.python.org/packages/source/r/rsa/rsa-%{version}.tar.gz
+Patch0:         rsa-use-system-setuptools.patch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildRequires:  python-devel
 BuildRequires:  python-distribute
@@ -42,6 +43,7 @@ PKCS#1 version 1.5.
 
 %prep
 %setup -q -n rsa-%{version}
+%patch0 -p1
 
 %build
 python setup.py build