Add "platform_system" to the environment when solving in Pypi #289
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Without it, the following YAML:
Will result in bringing in twisted-iocpsupport when solving on Linux despite the fact that that package is for Windows only.
This was due to the platform_system marker missing.
This PR also adds linux_{arch} for Linux platforms which is similar to what packaging does (see https://github.com/pypa/packaging/blob/main/packaging/tags.py#L434).