Stop hardcode platform tag when using zig

[messense]

Try to fix #2901 (comment)

[Copilot]

Pull request overview

This PR removes hardcoded platform tag determination when using Zig for cross-compilation on Linux glibc targets. Instead of forcing a specific manylinux version based on Rust compiler capabilities, the build now defers to auditwheel to automatically detect the appropriate compatibility tag based on the actual binary's dependencies and symbols.

• Changed zig+glibc builds to return None for platform tag instead of target.get_minimum_manylinux_tag()
• Removed test assertions that validated the hardcoded platform tag behavior
• Removed unused PlatformTag import from test file

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/build_options.rs	Changed zig+glibc builds to return None for compatibility tag instead of hardcoded minimum manylinux tag, allowing auditwheel to dynamically determine the appropriate tag based on actual binary dependencies
tests/common/integration.rs	Removed test logic that validated hardcoded platform tags for zig builds and removed now-unused PlatformTag import