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/asyn-thread.c

@@ -447,7 +447,13 @@ query_complete(DWORD err, DWORD bytes, LPWSAOVERLAPPED overlapped)
  * For builds without ARES, but with USE_IPV6, create a resolver thread
  * and wait on it.
  */
-static unsigned int CURL_STDCALL getaddrinfo_thread(void *arg)
+static
+#if defined(_WIN32_WCE)
+DWORD
+#else
+unsigned int
+#endif
+CURL_STDCALL getaddrinfo_thread(void *arg)
 {
   struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
   struct thread_data *td = tsd->td;
@@ -500,7 +506,13 @@ static unsigned int CURL_STDCALL getaddrinfo_thread(void *arg)
 /*
  * gethostbyname_thread() resolves a name and then exits.
  */
-static unsigned int CURL_STDCALL gethostbyname_thread(void *arg)
+static
+#if defined(_WIN32_WCE)
+DWORD
+#else
+unsigned int
+#endif
+CURL_STDCALL gethostbyname_thread(void *arg)
 {
   struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
   struct thread_data *td = tsd->td;

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

lib/curl_threads.h

@@ -52,8 +52,13 @@
 
 #if defined(USE_THREADS_POSIX) || 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);
 
 void Curl_thread_destroy(curl_thread_t hnd);