Update python-patch-ng to version 1.17.4 / rev 1 via SR 1120856
https://build.opensuse.org/request/show/1120856
by user mcepl + anag+factory
This is patch-ng — a Python module for parsing and applying unified diffs. It is needed by Conan, a C/C++ package manager, that I have packaged and will submit to Factory once patch-ng has made its way there.