Change Faiss to compile on Windows

[mdouze]

Checklist

• Used a fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

@h-vetinari This is for a try

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[isuruf]

@conda-forge-admin, rerender

[h-vetinari]

@conda-forge-admin, please rerender

[h-vetinari]

@mdouze @beauby Let me know if there's something I can do to help wake this PR from its slumber ;-)

[beauby]

@h-vetinari Hi, thanks for your work! We're currently in the process of porting Faiss to Windows, and will get back to you soon.