ci(windows): add linkage check

[ReenigneArcher]

Description

Add a GitHub Actions step that runs under msys2 to verify runtime linkage of built Windows executables. The step runs ldd on a set of binaries (build/sunshine.exe, build/tools/audio-info.exe, build/tools/dxgi-info.exe, build/tools/sunshinesvc.exe, build/tests/test_sunshine.exe), groups and logs the output, and fails CI if unexpected dependencies are found (missing libraries or references into toolchain/mingw/ucrt paths). zlib1.dll is allowed. This prevents shipping missing or toolchain-linked DLLs before the signing step.

Screenshot

Issues Fixed or Closed

• Resolves Latest Pre-Release v2026.513.230134 wont start - libicuin78.dll missing #5112

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[codecov]

Bundle Report

Bundle size has no change ✅

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@71323d3). Learn more about missing BASE report.
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5118   +/-   ##
=========================================
  Coverage          ?   17.83%           
=========================================
  Files             ?      111           
  Lines             ?    24009           
  Branches          ?    10620           
=========================================
  Hits              ?     4281           
  Misses            ?    15386           
  Partials          ?     4342           

Flag	Coverage Δ
Archlinux	11.23% <ø> (?)
FreeBSD-14.3-amd64	13.37% <ø> (?)
Homebrew-ubuntu-22.04	13.58% <ø> (?)
Linux-AppImage	12.16% <ø> (?)
Windows-AMD64	14.84% <ø> (?)
Windows-ARM64	13.23% <ø> (?)
macOS-arm64	19.01% <ø> (?)
macOS-x86_64	18.37% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 71323d3...3985357. Read the comment docs.