[Bug 51918] wine-gecko 2.47.2 fails to build on host systems with python 3.10

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51918

--- Comment #3 from Patrick  ---
(In reply to Jacek Caban from comment #1)
> Most of the patch looks good and should not break older Python, so I pushed
> it, thanks.
>
> virtualenv.py looks suspicious through. What's the problem that it's trying
> to fix?

Thanks Jacek. As Rafał commented, the sys.version[:3] -> sys.version[:4] change
in virtualenv.py was to also handle python 3.10 (and to prevent it to be
detected as python 3.1).