lib: fix thread entry point to return DWORD on WinCE

We already do this in `tests/server/util.c`:
97e5e37cc8/tests/server/util.c (L604-L606)
and in `sockfilt.c`, `lib3026.c`.

Before this patch it returned `unsigned int`.

Closes #13877

lib/curl_threads.c

@@ -100,8 +100,13 @@ int Curl_thread_join(curl_thread_t *hnd)
 
 #elif defined(USE_THREADS_WIN32)
 
-/* !checksrc! disable SPACEBEFOREPAREN 1 */
-curl_thread_t Curl_thread_create(unsigned int (CURL_STDCALL *func) (void *),
+curl_thread_t Curl_thread_create(
+#if defined(_WIN32_WCE)
+                                 DWORD
+#else
+                                 unsigned int
+#endif
+                                 (CURL_STDCALL *func) (void *),
                                  void *arg)
 {
 #ifdef _WIN32_WCE