Enable Windows builds

[Anthchirp]

This is for #1 just to remind myself what the current issues are

Checklist

• Used a personal 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.

[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.

I do have some suggestions for making it better though...

For recipe:

• License is not an SPDX identifier (or a custom LicenseRef) nor an SPDX license expression.

Documentation on acceptable licenses can be found here.

[Anthchirp]

@conda-forge-admin, please rerender

[Anthchirp]

Appears promising.

Need to look into:

• additional files in the output directory
• build output says "debug"
• HDF5 runtime dependency
• conda verify?
• license details

[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.

[Anthchirp]

Licensing review flagged a missing license file upstream
nexusformat/HDF5-External-Filter-Plugins#15

[Anthchirp]

@conda-forge-admin, please rerender