feat(windows-drivers): vendor wdk 0.5.1 + add ApiSubset::Iddcx (M1 spike)

Vendor the published, self-contained windows-drivers-rs 0.5.1 crates
(wdk-build, wdk-sys) under vendor/ and add a first-class ApiSubset::Iddcx that
bindgens iddcx/1.10/IddCx.h in an extra pass reusing bindgen::Builder::wdk_default
(allowlist_file (?i).*iddcx.* — emits only IddCx items; WDF/DXGI types resolve to
the shared base/wdf bindings, type-identity by construction). Mirrors the existing
gpio/hid/spb subsets exactly: wdk-build gets the enum variant + iddcx_headers()
(UMDF-only), wdk-sys gets generate_iddcx + the iddcx feature + pub mod iddcx.
[patch.crates-io] redirects all wdk-sys/wdk-build (incl. wdk 0.4.1 transitive) to
the patched copies. wdk-probe enables the iddcx feature.

MAKE-OR-BREAK: does IddCx.h bindgen in wdk-sys config without a header conflict
(issue #515) + does the generated module compile (type-identity)? CI answers it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packaging/windows/drivers/vendor/wdk-sys/src/iddcx.rs

@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft Corporation
+// License: MIT OR Apache-2.0
+
+//! Direct FFI bindings to IddCx APIs from the Windows Driver Kit (WDK)
+//!
+//! This module contains all bindings to functions, constants, methods,
+//! constructors and destructors in the following headers: `iddcx/1.10/IddCx.h`. Types are not included in this module, but are available in the
+//! top-level `wdk_sys` module.
+
+#[allow(
+    missing_docs,
+    reason = "most items in the WDK headers have no inline documentation, so bindgen is unable to \
+              generate documentation for their bindings"
+)]
+mod bindings {
+    #[allow(
+        clippy::wildcard_imports,
+        reason = "the underlying c code relies on all type definitions being in scope, which \
+                  results in the bindgen generated code relying on the generated types being in \
+                  scope as well"
+    )]
+    #[allow(
+        unused_imports,
+        reason = "in certain versions of the WDK, there are no functions related to IddCx that can \
+                  be generated by bindgen, so these types are unused"
+    )]
+    use crate::types::*;
+
+    include!(concat!(env!("OUT_DIR"), "/iddcx.rs"));
+}
+#[allow(
+    unused_imports,
+    reason = "in certain versions of the WDK, there are no functions related to IddCx that can be \
+              generated by bindgen, so the `bindings` module is empty"
+)]
+pub use bindings::*;