py-borgbackup: add patch for previous

sysutils/py-borgbackup/patches/patch-setup.py

@@ -0,0 +1,15 @@
+$NetBSD: patch-setup.py,v 1.3 2018/04/21 12:37:46 wiz Exp $
+
+Use latest msgpack version
+
+--- setup.py.orig	2018-03-30 07:08:16.000000000 +0000
++++ setup.py
+@@ -39,7 +39,7 @@ install_requires = [
+     # msgpack pure python data corruption was fixed in 0.4.6.
+     # msgpack 0.5.0 was a bit of a troublemaker.
+     # also, msgpack dropped py34 support at 0.5.0.
+-    'msgpack-python>=0.4.6,<0.5.0',
++    'msgpack',
+ ]
+ 
+ # note for package maintainers: if you package borgbackup for distribution,