fix(release): select x64 xwin libraries for x64 builds

[zackees]

The x64 Windows release path searched every xwin architecture directory and selected aarch64 libraries first. Restrict the CRT, UM, and UCRT lookup to x64 so lld-link does not receive ARM64 import libraries.\n\nThe prior 2.5.4 release failed with
tdll.lib ... machine type arm64 conflicts with x64.

Summary by CodeRabbit

• Bug Fixes
  • Improved Windows x86_64 build reliability by targeting the correct architecture-specific library paths.
  • Applied the fix consistently to release binary and Python extension builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 8941dba8-c92f-4dbf-8468-b833c3ef193b

📥 Commits

Reviewing files that changed from the base of the PR and between ec976ca and 2bd0068.

📒 Files selected for processing (1)

• .github/workflows/template_native_build.yml

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📝 Walkthrough

Walkthrough

The Windows x86_64 MSVC workflow now searches managed xwin libraries within specific x64 directories for both release binaries and Python extensions. Validation, symlink handling, and RUSTFLAGS exports are unchanged.

Changes

Windows xwin library paths

Layer / File(s)	Summary
Target x64 xwin libraries .github/workflows/template_native_build.yml	Both Windows MSVC build branches now use architecture-specific x64 search roots for managed libraries while retaining existing validation and linker configuration.

Estimated code review effort: 2 (Simple) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the change to prefer x64 xwin libraries for x64 Windows builds.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/x64-msvc-xwin-libdirs

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