fix!: generated types from DECLARE_HANDLE macro are marked as opaque, non-copy, and non-default

[leon-xd]

This pull request fixes default bindgen behavior that resulted in types from the WDK macro DECLARE_HANDLE not being marked as opaque. My PR introduces a new function in the trait BuilderExt, opaque_windows_handle_types, which searches through the current Config's include_paths, and finds each instance of the DECLARE_HANDLE macro in order to mark these types as opaque_type, no_copy, and no_default.

Validation

The effect of this change can be found in opaque_handles.zip. There are three directories: one for the original versions of the file types.rs generated by bindgen, one for the new versions of types.rs, and one containing the diffs between the two.

The DECLARE_HANDLE macro is defined as follows:

#define DECLARE_HANDLE(name) struct name##__{int unused;}; typedef struct name##__ *name

In each diffed file, you can see each struct defined by this macro, marked by pub unused: ::core::ffi::c_int, is now replaced by an opaque type, marked by pub _bindgen_opaque_blob: u32. We can be sure of this approach as there are no generated structs in the new types.rs files that contain the unused member.

Breaking Changes

Types generated by bindgen for the WDK have been edited. These are public facing, so therefore this PR contains a breaking change.

[Copilot]

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

crates/wdk-build/src/bindgen.rs:166

• The phrase 'open and closed parentheses' should be corrected to 'opening and closing parentheses'.

// We find the open and closed parentheses in each line, and push the