blender: verify expected Python version during build

Upstream builds and tests with a specific Python version. Further, the
Blender addon ecosystem generally expects that version to be used, so
ensure that the correct version is used when upstream changes. Python
often makes backwards-incompatible changes in “minor” releases.

To quote upstream source code:

> Blender only supports a single Python version at the moment.

Perform the check during preConfigure since we can check it then and so
it avoids wasting time configuring+building and then failing.

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