meson: fix finding Python on Windows
What does this MR do and why?
Fixes #10319 (closed).
On Windows, a venv has no versioned aliased to python. python3 will never be found from a venv.
Edited by Aleksi Sapon
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
Fixes #10319 (closed).
On Windows, a venv has no versioned aliased to python. python3 will never be found from a venv.