run-tests: cleanup windows generation of the python / python3 pointeur
They are no need to generate then in RUNTESTDIR and we don't need a python2
executable. (because not test ever use `python2` explicitly).
This is probably still not perfect, but at least it is better.
Differential Revision: https://phab.mercurial-scm.org/D11045
== New Features ==
* `hg config` now has a `--source` option to show where each
configuration value comes from.
== Default Format Change ==
These changes affects newly created repositories (or new clone) done with
Mercurial 5.8.
== New Experimental Features ==
== Bug Fixes ==
== Backwards Compatibility Changes ==
== Internal API Changes ==