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Add windows SemLock and missing _winapi functions#7185

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youknowone wants to merge 5 commits intoRustPython:mainfrom
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Add windows SemLock and missing _winapi functions#7185
youknowone wants to merge 5 commits intoRustPython:mainfrom
youknowone:winapi

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Add SemLock class using Windows semaphore APIs (CreateSemaphoreW,
WaitForSingleObjectEx, ReleaseSemaphore) so test_multiprocessing
suites are no longer skipped with "lacks a functioning sem_open".
Also add sem_unlink as no-op and flags dict for Windows.
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Code has been automatically formatted

The code in this PR has been formatted using:

  • cargo fmt --all
    Please pull the latest changes before pushing again:
git pull origin winapi

Add 13 functions: ReadFile, SetNamedPipeHandleState, CreateFileMapping,
OpenFileMapping, MapViewOfFile, UnmapViewOfFile, VirtualQuerySize,
CopyFile2, ResetEvent, CreateMutex, OpenEventW, LoadLibrary,
_mimetypes_read_windows_registry.

Add constants: INVALID_HANDLE_VALUE, FILE_MAP_READ/WRITE/COPY/EXECUTE.

Change WinHandle integer type from usize to isize so negative values
like INVALID_HANDLE_VALUE (-1) can be passed from Python.
- Rename winapi.rs to _winapi.rs with #[path] attribute
- Rename CreateMutex to CreateMutexW
- Add missing constants: ERROR_ACCESS_DENIED, ERROR_PRIVILEGE_NOT_HELD,
  PROCESS_ALL_ACCESS, 10 STARTF_ constants, LOCALE_NAME_SYSTEM_DEFAULT,
  LOCALE_NAME_USER_DEFAULT, COPY_FILE_DIRECTORY
- Fix OpenMutexW return type and ReleaseMutex param type to use WinHandle
Use FromArgs structs so overlapped parameter can be passed as
a keyword argument (overlapped=True), matching the CPython API.
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