gnu: Add python-genshi.

* gnu/packages/python.scm (python-genshi, python2-genshi): New variables.
 * gnu/packages/patches/python-genshi-add-support-for-python-3.4-AST.patch: New file.
 * gnu/packages/patches/python-genshi-buildable-on-python-2.7.patch: New file.
 * gnu/packages/patches/python-genshi-disable-speedups-on-python-3.3.patch: New file.
 * gnu/packages/patches/python-genshi-fix-tests-on-python-3.5.patch: New file.
 * gnu/packages/patches/python-genshi-isstring-helper.patch: New file.
 * gnu/packages/patches/python-genshi-stripping-of-unsafe-script-tags.patch: New file.
 * gnu/local.mk (dist_patch_DATA): Add them.

Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>

gnu/packages/patches/python-genshi-buildable-on-python-2.7.patch

@@ -0,0 +1,25 @@
+From 32bfaa7cc1c736fd62fcbb6414de9498dc20ed07 Mon Sep 17 00:00:00 2001
+From: Adriano Peluso <catonano@gmail.com>
+Date: Wed, 5 Apr 2017 15:13:06 +0200
+Subject: [PATCH 2/2] buildable on python27 too
+
+---
+ genshi/template/directives.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/genshi/template/directives.py b/genshi/template/directives.py
+index 6fd0f28..1f70ef6 100644
+--- a/genshi/template/directives.py
++++ b/genshi/template/directives.py
+@@ -266,7 +266,7 @@ class DefDirective(Directive):
+         if isinstance(ast, _ast.Call):
+             self.name = ast.func.id
+             for arg in ast.args:
+-                if isinstance(arg, _ast.Starred):
++                if hasattr(_ast, 'Starred') and isinstance(arg, _ast.Starred):
+                     # Python 3.5+
+                     self.star_args = arg.value.id
+                 else:
+-- 
+2.12.0
+