feat: add linker args for VHF lib to wdk-build

[Alan632]

Description

Add linker arguments for the VHF library (feature gated) to the build script output for each driver type so drivers using the VHF don't have to hardcode the output in their own build scripts.

wdk-build/lib.rs

• For each driver type (WDM/KMDF/UMDF) add the correct Vhf lib linker arguments, gated by the "vhf" feature flag.

wdk-build/Cargo.toml

• Add the vhf feature

Verification

Built a driver and ensured vhf linker args were still in build output after removing the hardcoded line in the driver's build.rs.

[Copilot]

Pull request overview

Adds an opt-in vhf feature to wdk-build so driver crates can automatically link the appropriate Virtual HID Framework (VHF) import library without hardcoding linker directives in their own build.rs.

Changes:

• Add a vhf Cargo feature to wdk-build.
• When vhf is enabled, emit VhfKm.lib for WDM/KMDF builds and VhfUm.lib for UMDF builds via build script output.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
crates/wdk-build/src/lib.rs	Emits VHF linker input per driver type under #[cfg(feature = "vhf")].
crates/wdk-build/Cargo.toml	Defines the new vhf feature flag.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.69%. Comparing base (efa6c11) to head (70305e3).

Additional details and impacted files

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  Coverage   78.69%   78.69%           
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  Files          25       25           
  Lines        5234     5234           
  Branches     5234     5234           
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  Hits         4119     4119           
  Misses        995      995           
  Partials      120      120           

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[wmmc88]

we shouldn't need to introduce a new feature to wdk-build for this. vhf headers are tied to the HID API subset, and so linking of the vhf libraries should also be tied to that API subset. Look at how the API subsets are threaded thru from the features in wdk-sys and see how we can maybe have this automatically link in the relevant libraries.

Keep in mind that linker directives must still happen only for the final binary