Test the cross-compiled Windows GNU build

[SichangHe]

I wish someone on Windows can test the GNU build to see if it works correctly. The build is available starting from Release v0.3.7.

In #66, #65, #64, I added CD to cross compile x86_64-pc-windows-gnu, aarch64-apple-darwin and x86_64-unknown-linux-musl. I am confident that the macOS and the MUSL build would work, as I have corresponding CIs for them. The Windows GNU build, however, could not simply be tested using cargo due to crossing from Linux to Windows.

The Windows GNU build is also special for windows users because it is currently the only Windows build that uses quick-js for katex instead of duktape and does not have the issue mentioned in #39. Making this GNU build locally on a Windows machine is not easy, so this build in the release would likely be the best choice for Windows users if it works.

[hwf1324]

你好，简单的尝试了一下。抱歉的是它并没有在 Windows 上成功构建。

error: failed to run custom build command for `libquickjs-sys v0.9.0`

顺便，目前的版本似乎与 mdbook v0.4.27 不兼容：

This mdbook-katex was built against mdbook v0.4.26, but we are being called from mdbook v0.4.27. If you have any issue, this might be a reason.

[SichangHe]

你好，简单的尝试了一下。抱歉的是它并没有在 Windows 上成功构建。

error: failed to run custom build command for `libquickjs-sys v0.9.0`

The purpose is not to build the GNU build on Windows but rather to provide a binary which you can find in Release.
That said, I would like to know which steps you took to make the build fail.

顺便，目前的版本似乎与 mdbook v0.4.27 不兼容：

This mdbook-katex was built against mdbook v0.4.26, but we are being called from mdbook v0.4.27. If you have any issue, this might be a reason.

The warning about the version mismatch can be ignored as long as the binary works. I did not update mdbook-katex to use mdbook v0.4.27 because it was merely a rollback "update."

[hwf1324]

抱歉，我没能很好阅读说明。
是的，现在 #39 的示例已经成功工作。
真是太棒了！

That said, I would like to know which steps you took to make the build fail.

stable-x86_64-pc-windows-gnu (directory override for 'D:\mdbook\mdbook-katex')

[SichangHe]

抱歉，我没能很好阅读说明。 是的，现在 #39 的示例已经成功工作。 真是太棒了！

Thank you very much for testing it out. It is indeed great that it fully works.

That said, I would like to know which steps you took to make the build fail.

stable-x86_64-pc-windows-gnu (directory override for 'D:\mdbook\mdbook-katex')

Yes, I know the stable-x86_64-pc-windows-gnu build does not build on Windows. That is why I had to make it cross compile in CD and it took me so long to produce this solution.

Closing this issue because the goal, to test the Windows GNU build, has been achieved.