* Disallow instantiation of sys.getwindowsversion type
Add slot_new to PyWindowsVersion that raises TypeError,
matching sys.flags behavior.
* Remove incorrect WSAHOS errno constant
WSAHOS was hardcoded as an alias for WSAHOST_NOT_FOUND, but
CPython guards it with #ifdef WSAHOS which doesn't exist in
modern Windows SDK headers.
* Fix mmap resize to raise OSError instead of SystemError
* Fix CreateProcess with empty environment on Windows
Empty env dict produced a single null terminator, but
CreateProcessW requires a double null for a valid empty
environment block.
* Revert mmap resize error to SystemError and fix errno.rs formatting
mmap resize raises SystemError (not OSError) when mremap is unavailable,
matching CPython behavior. test_mmap catches SystemError to skip unsupported
resize operations.
* Fix named mmap resize to raise OSError and unmark test_sleep expectedFailure
Named mmap resize on Windows should raise OSError (not SystemError).
Remove expectedFailure mark from TimeEINTRTest.test_sleep as it now passes.
* Use expectedFailureIf for TimeEINTRTest.test_sleep on Linux
test_sleep passes on macOS but fails on Linux due to timing.
* Remove expectedFailure for TimeEINTRTest.test_sleep
test_sleep now passes on all platforms.
