Winstore: allow SetThreadPriority call

This mandates 8.1 though

src/win32/thread.c

@@ -511,10 +511,8 @@ static int vlc_clone_attr (vlc_thread_t *p_handle, bool detached,
     if (p_handle != NULL)
         *p_handle = th;
 
-#if !VLC_WINSTORE_APP
     if (priority)
         SetThreadPriority (th->id, priority);
-#endif
 
     return 0;
 }
@@ -549,10 +547,8 @@ int vlc_clone_detach (vlc_thread_t *p_handle, void *(*entry) (void *),
 
 int vlc_set_priority (vlc_thread_t th, int priority)
 {
-#if !VLC_WINSTORE_APP
     if (!SetThreadPriority (th->id, priority))
         return VLC_EGENERIC;
-#endif
     return VLC_SUCCESS;
 }