Update python-Pyro4 to rev 6 via SR 764902
https://build.opensuse.org/request/show/764902
by user dimstar_suse
- Properly conditionalize python2 build for older openSUSE
- Update to 4.77
* dropped support for Python 3.4 (which has reached end-of-life
status). Supported Python versions are now 2.7, and 3.5 or
newer.
* URIs now allow spaces in the location part. Useful for unix
domain sockets.
- Dropped python2 subpackage due to dropping backports dependency.