Replaced automatic closing with window parameter.

src/win32_window.c

@@ -532,8 +532,7 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
 
         case WM_CLOSE:
         {
-            // Flag this window for closing (handled in glfwPollEvents)
-            window->closeRequested = GL_TRUE;
+            _glfwInputWindowCloseRequest(window);
             return 0;
         }
 
@@ -1249,7 +1248,7 @@ void _glfwPlatformPollEvents(void)
                 window = _glfwLibrary.windowListHead;
                 while (window)
                 {
-                    window->closeRequested = GL_TRUE;
+                    _glfwInputWindowCloseRequest(window);
                     window = window->next;
                 }