docs: Windows builds require the C++ ATL component

[JF10R]

What does this PR do?

Documents a missing Windows build prerequisite: the "C++ ATL for latest build tools" VS component. src/jsc/bindings/windows/rescle.cpp includes atlstr.h (line 35) and links atls.lib; neither ships with the bare "Desktop Development with C++" workload. Also adds Microsoft.VisualStudio.Component.VC.ATL to the WinGet install line so a fresh setup gets it from the start.

How did you verify your code works?

Fresh Windows build of current main (c3995e43d5) following the existing doc verbatim fails twice: at object 1207/1240 (fatal error: 'atlstr.h' file not found) and, with headers borrowed from another toolset, again at link (lld-link: error: could not open 'atls.lib'). Installing Microsoft.VisualStudio.Component.VC.ATL via the VS installer fixed both and the build completed (bun-debug.exe, used to verify #39383).

[claude]

Claude Code Review

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[Copilot]

Pull request overview

Updates the Windows build documentation to include an additional Visual Studio component required to compile/link Bun’s Windows-specific JSC resource code, preventing fresh Windows setups from failing due to missing ATL headers/libraries.

Changes:

• Document that the Visual Studio install must include the “C++ ATL for latest build tools” component (needed for atlstr.h / atls.lib).
• Update the WinGet install command to include Microsoft.VisualStudio.Component.VC.ATL.

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Walkthrough

The Windows build documentation now requires Visual Studio’s ATL component. The WinGet command installs Microsoft.VisualStudio.Component.VC.ATL with the existing components.

Changes

Windows build prerequisites

Layer / File(s)	Summary
Document the ATL prerequisite docs/project/building-windows.mdx	The prerequisites mention the ATL component required by rescle.cpp. The WinGet command installs Microsoft.VisualStudio.Component.VC.ATL.

Suggested reviewers: robobun

Merge Risk: ⚪ Minimal · up to d4e3c

This localized documentation update clarifies the Windows build prerequisite and includes the ATL component in the setup command; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description includes both required sections and clearly explains the documentation change and the Windows build verification.
Title check	✅ Passed	The title clearly and concisely identifies the main documentation change: the required C++ ATL component for Windows builds.
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.

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