patch 9.0.0400: GUI test sometimes hangs on CI

Problem:    GUI test sometimes hangs on CI.
Solution:   Delete a test file explicitly. (Ken Takata, closes #11072)

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    400,
 /**/
     399,
 /**/