Fix windows

[conda-forge-linter]

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

I wanted to let you know that I linted all conda-recipes in your PR (recipe) and found some lint.

Here's what I've got...

For recipe:

• When defining a source/url please add a sha256, sha1 or md5 checksum (sha256 preferably).
• When defining a source/url please add a sha256, sha1 or md5 checksum (sha256 preferably).
• When defining a source/url please add a sha256, sha1 or md5 checksum (sha256 preferably).
• When defining a source/url please add a sha256, sha1 or md5 checksum (sha256 preferably).
• When defining a source/url please add a sha256, sha1 or md5 checksum (sha256 preferably).
• When defining a source/url please add a sha256, sha1 or md5 checksum (sha256 preferably).
• When defining a source/url please add a sha256, sha1 or md5 checksum (sha256 preferably).
• When defining a source/url please add a sha256, sha1 or md5 checksum (sha256 preferably).

[isuruf]

@conda-forge-admin, rerender