Fix build error with Ruby 3.1 on Windows

[Watson1978]

Since Ruby 3.2, pipe function declaration is provided in https://github.com/ruby/ruby/blob/21c708ee802e1a59901eccc6448e40e8f72189b8/include/ruby/missing.h#L292 However, it does not provided it with Ruby 3.1.

This patch will define pipe macro to use proper function due to fix build error.

Types of Changes

• Bug fix.

Fix https://github.com/socketry/io-event/issues/111

Contribution

• [ ] I added tests for my changes.
• [x] I tested my changes locally.
• [x] I agree to the Developer's Certificate of Origin 1.1.

[ioquatix]

I may need to review the test failures, it may be unrelated to the PR. I'll try to take a look shortly.

[Watson1978]

Thanks

[ioquatix]

This is a good start to better windows support. Thanks.

[ioquatix]

I have released v1.7.0 which works with Windows, tested on Ruby v3.1+.

For better compatibility, we should work on https://github.com/socketry/io-event/pull/97.

[Watson1978]

Thanks!