Use double quotes for version check on old CPython on Windows

[hugovk]

Fixes #6437.

@cgohlke found a failure with setuptools 65 on Python 3.7-3.8 but with SETUPTOOLS_USE_DISTUTILS=stdlib

Testing a CI matrix on Windows with:

        python-version: ["3.7", "3.8", "3.9"]
        architecture: ["x64"]
        SETUPTOOLS_USE_DISTUTILS: ["", "stdlib"]
        setuptools-max-version: ["60", "66"]

I find that:

CPython	SETUPTOOLS_USE_DISTUTILS	setuptools	Quotes needed
3.7		<60	double
3.7		<66	double
3.7	stdlib	<60	double
3.7	stdlib	<66	double
3.8		<60	double
3.8		<66	double
3.8	stdlib	<60	double
3.8	stdlib	<66	double
3.9		<60	single
3.9		<66	single
3.9	stdlib	<60	single
3.9	stdlib	<66	single

Testing this fix on the same matrix passes for all:

• https://github.com/hugovk/Pillow/actions/runs/3344484651

[radarhere]

So this is just reverting #6450. My best guess is that something else in our Windows build process changed in the meantime.

[hugovk]

Yeah, possibly also changes in setuptools versions somewhere between 59 and 65. There's been quite a lot of changes in setuptools in an attempt to modernise "a hot mess of legacy code", and I expect more.

And distutils is planned to be removed in Python 3.12 (October 2023), which the vendoring of distutils into setuptools 60 is a first step.

It might be worth seeing if we can migrate away from setuptool to something more modern, such as hatchling, but with a thousand-line setup.py it's certainly not a job for release day :)