Pass a pointer lpThreadId to CreateThread instead of a null pointer

This parameter must not be null on 9X/ME.

library/std/src/sys/windows/thread.rs

@@ -31,13 +31,17 @@ impl Thread {
         // PTHREAD_STACK_MIN bytes big. Windows has no such lower limit, it's
         // just that below a certain threshold you can't do anything useful.
         // That threshold is application and architecture-specific, however.
+
+        // this is needed on 9X/ME - passing null_mut() is not allowed
+        let mut thread_id = 0;
+
         let ret = c::CreateThread(
             ptr::null_mut(),
             stack,
             Some(thread_start),
             p as *mut _,
             c::STACK_SIZE_PARAM_IS_A_RESERVATION,
-            ptr::null_mut(),
+            &mut thread_id,
         );
         let ret = HandleOrNull::from_raw_handle(ret);
         return if let Ok(handle) = ret.try_into() {