- Update to version 2020.04, first release in many years (unfortunately,
it was tagged just before the commit 06e4728 which fixed building with
Python 3.x, point GH_TAGNAME to it instead of pulling a patch)
- Drop explicit `python:build' from USES list, because `waf' implies it
- Add missing USE_XORG and put `xorg' on USES list
- For the time being, don't force C++14 while C++11 is sufficient until
the code really starts using new features (see GitHub commit a6bbc01)
PR: 246793
Submitted by: David Schlachter