misc/thread_tools: fix incorrect win32 check

misc/thread_tools.c

@@ -111,7 +111,7 @@ static void cancel_destroy(void *p)
         close(c->wakeup_pipe[1]);
     }
 
-#ifdef __MINGW32__
+#ifdef _WIN32
     if (c->win32_event)
         CloseHandle(c->win32_event);
 #endif
@@ -148,7 +148,7 @@ static void trigger_locked(struct mp_cancel *c)
     if (c->wakeup_pipe[1] >= 0)
         (void)write(c->wakeup_pipe[1], &(char){0}, 1);
 
-#ifdef __MINGW32__
+#ifdef _WIN32
     if (c->win32_event)
         SetEvent(c->win32_event);
 #endif
@@ -176,7 +176,7 @@ void mp_cancel_reset(struct mp_cancel *c)
         }
     }
 
-#ifdef __MINGW32__
+#ifdef _WIN32
     if (c->win32_event)
         ResetEvent(c->win32_event);
 #endif