Python 2 isn't supported in gyp-next anymore,
so we should stop finding/trying to use Python 2.

Note: This commit is required for the previous commit to pass tests.
I have left it separate for clarity during review of this PR.
But it should be squashed with the previous commit if/when merging.

This reverts commit c255ffb.

Note: My intent here is not to actually restore any Python 2 support,
just to make it clearer  where the comment text originally came from.
It would be fair to squash this with the next commit if/when merging.

Ensures the py.exe launcher only finds Python 3.
(Only applies to Windows users.)

Co-authored-by: Christian Clauss <[email protected]>

Note: This is required for the previous commit to pass tests.
Please squash this with the previous commit if/when merging.

Paths are installed with a "-32" suffix: "Python[version]-32"
I forgot to add the "-32" in previous commits.

Note: It would be good to squash this with the previous two commits.

32-bit Windows doesn't have a "Program Files (x86)" folder,
only "Program Files".

Reduces boilerplate code.

Also, refactored to drop the dependency on the 'path' module.

These paths may be localized to other languages,
or placed on another drive.

(These paths appear to be mostly standardized on Windows 10,
but they can apparently be relocated on Windows Server,
and may be localized on some older version(s) of Windows.)

This should be a reliable fallback
in case the environment variables have been deleted or unset.

Note: This fixes an oversight in the previous commit,
and is required for the previous commit to pass tests.
Please squash this with the previous commit if/when merging.