patch 9.0.0408: GUI test sometimes fails on MS-Windows

Problem:    GUI test sometimes fails on MS-Windows.
Solution:   Make sure Vim is the foreground window. (Ken Takata, closes #11077)

src/gui_w32.c

@@ -8649,6 +8649,7 @@ test_gui_w32_sendevent(dict_T *args)
 	inputs[0].ki.wVk = vkCode;
 	if (STRICMP(event, "keyup") == 0)
 	    inputs[0].ki.dwFlags = KEYEVENTF_KEYUP;
+	(void)SetForegroundWindow(s_hwnd);
 	SendInput(ARRAYSIZE(inputs), inputs, sizeof(INPUT));
     }
     else

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    408,
 /**/
     407,
 /**/