pycairo: enable for python35

The patch was taken from FreeBSD, it is also used on debian. see:
https://svnweb.freebsd.org/ports/head/graphics/py3-cairo/files/pycairo-1.10.0-waf-py3_5.patch?revision=401900&view=markup

pkgs/development/python-modules/pycairo/waf-py3_5.patch

@@ -0,0 +1,10 @@
+--- a/waflib/Build.py
++++ b/waflib/Build.py
+@@ -151,6 +151,7 @@ class BuildContext(Context.Context):
+ 				f.close()
+ 		self.init_dirs()
+ 	def store(self):
++		return
+ 		data={}
+ 		for x in SAVED_ATTRS:
+ 			data[x]=getattr(self,x)