fix: set proper include and lib paths for building within conda

[mdealencar]

conda on Windows uses CONDA_PREFIX/Library/{include,lib} instead of the CONDA_PREFIX/{include,lib} previously used in setup.py. This PR checks the system platform and uses the correct paths. Additionally, it makes the variable includedirs always a list, which also solves a failure in building.

[Joao-Dionisio]

Hey @mdealencar thank you! I'm not a big infrastructure guy, but is this essentially doing the same as #1106 but for conda?

[mdealencar]

It seems like #1106 left out one assignment of includedirs as a str, which caused the error I observed (and is fixed in this PR). But this PR fixes also a mistake in the actual lib and include paths within the conda environment, which is different on Windows than on POSIX systems.

[Copilot]

Pull request overview

This PR fixes conda environment path configuration for Windows builds by using the correct Library/include and Library/lib subdirectories within CONDA_PREFIX, as conda on Windows uses a different directory structure than other platforms. The change also ensures includedirs is consistently defined as a list, preventing build failures.

• Platform-specific conda path handling for Windows vs non-Windows systems
• Consistent list format for includedirs variable across all platforms

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