Enable QtWinExtras for Windows Build

[n-elie]

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.

[mingwandroid]

Did you test this? It doesn't work. There's a typo in QtWinExtas, also you are enabling QtSerialPort in this.

[n-elie]

I was not able to test because pyqt source code is not available at the given adress anymore. Also, QtSerialPort was already enabled.

[n-elie]

Would it be allowed to use archive.org to get the source code?

[jschueller]

they are available on macports, but unfortunately I cant find PyQtChart_gpl-5.12.tar.gz
https://distfiles.macports.org/py-pyqt5/PyQt5_gpl-5.12.3.tar.gz
https://distfiles.macports.org/py-sip/sip-4.19.18.tar.gz
https://distfiles.macports.org/py-pyqt5/PyQtWebEngine_gpl-5.12.1.tar.gz