fix(rust): Tweak rustflags added in #14820

[leaysgur]

In #14820, new rustflags for linux was added.

But it causes CI error: https://github.com/oxc-project/oxc/actions/runs/19061338376/job/54441526510#step:8:59

[leaysgur]

• fix(rust): Tweak rustflags added in #14820 #15264 👈 (View in Graphite)
• main

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[Copilot]

Pull Request Overview

This PR removes Linux-specific linker configuration from the Cargo build settings. The change eliminates custom rustflags that were previously applied to Linux targets, specifically removing the LLD linker feature flag and unresolved symbol warning configuration.

Key Changes:

• Removed Linux target-specific rustflags configuration block
• Cleaned up linker feature and link argument specifications for Linux builds

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[leaysgur]

Remove bin section seems not enough.

Need to remove main.rs itself too, which requires a bit refactoring.

• Remove main.rs
• Remove pub fn things from lib.rs, move some of them to run.rs

I will retry tomorrow.